Patent Publication Number: US-2023149576-A1

Title: Unified airflow system for ultraviolet disinfection devices

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present patent application incorporates the subject matter of the following patent applications, by reference and in their entirety: U.S. Non-Provisional patent application Ser. No. 15/095,212, filed Apr. 11, 2016. and titled “TARGETED SURFACE DISINFECTION DEVICE WITH PULSED UV LIGHT” and U.S. Provisional Patent. Application Ser. No. 62626483. filed Feb. 5, 2018, and titled “AN ULTRAVIOLET DISINFECTION DEVICE WITH A CLEANING UNIT,” in which the inventors herein were listed as co-inventors. 
    
    
     TECHNICAL FIELD 
     The subject matter described herein generally relates to ultraviolet (UV) disinfection devices and particularly relates to a unified airflow system for UV disinfection devices. 
     BACKGROUND 
     Ultraviolet (UV) light is widely known for contactless surface disinfection. When used in addition to contact-based surface cleaning tasks, brushing, wiping, etc., UV-based disinfection enhances pathogen deactivation on surfaces such as door knobs, cupboards, and floors. Of late, various surface cleaning equipment have become available with UV disinfection capabilities. One such surface cleaning equipment is a floor vacuum-cleaner fitted with a UV lamp that emits UV light to deactivate pathogens White extracting dirt from a floor. However, the extent of such UV disinfection is limited by the positioning of UV lamp on the vacuum cleaner. 
     In one approach, the UV lamp is typically positioned proximate to a suction opening or an air-nozzle of the vacuum cleaner. Since the air drawn into the air-nozzle via the suction opening becomes unclean with dirt, the UV lamp is typically screened to prevent any operational interference by the unclean air. However, such screening prevents the drawn an from cooling-off the UV lamp that heats-up during operation, thereby deteriorating life and performance of the UV lamp over time. Moreover, the UV lamp, at such positions, projects the UV light towards the floor or adjacent lower surfaces such as floor baseboards, and is unable to disinfect surfaces, e.g., table tops, door knobs, etc., located at a substantial height from the floor. As a result, the UV disinfection is limited to surfaces close to the ground or those of the vacuum cleaner itself such as the vacuum cleaner body. 
     In another approach, the UV lamp is usually located away from the suction opening or the air nozzle, for example, on top of the vacuum cleaner body. Although the UV lamp thus projects the UV light away from the floor, an additional component such as a fan is typically required to cool-off the UV lamp installed at these locations. Such additional component amplifies the manufacturing or assembly cost and increases an Overall weight of the vacuum cleaner to impede easy maneuverability. Moreover, at a set orientation, the UV lamp projects the UV light to a narrow surface area causing significant delays when attempting to disinfect a large area such as a room. 
     On the other hand, traditional area or room UV disinfection devices are used along with the conventional surface cleaning equipment such as mops and floor vacuum cleaners for faster and cc/holistic decontamination. However, such use of additional cleaning equipment increases the storage and upkeep cost to make the task of everyday surface decontamination expensive and cumbersome. Moreover, typical room UV disinfection devices generate copious amounts of harmful ozone during operation that can adversely affect the health of a user over time. 
     SUMMARY 
     Embodiments of the present disclosure describe a unified airflow system for ultraviolet disinfection devices. One embodiment of the present disclosure includes a unified airflow assembly and a control unit. The unified airflow assembly provides a shared airflow passage between a UV source and an airflow accessory capable of extracting contaminants from a target surface using a suction airstream. The UV source may be fluidically disconnected from the airflow accessory. The unified airflow assembly may include at least one air restriction unit in the shared airflow passage for manipulating a suction airstream therein. The control unit may be configured to drive the at least one air restriction unit to restrict the suction airstream to only one of the UV source and the airflow accessory. 
     One aspect of the present disclosure is to provide an integrated device for contact and contactless decontamination. 
     Another aspect of the present disclosure is to provide a large-area UV disinfection device. 
     Yet another aspect of the present disclosure is to cool a UV lamp of the UV disinfection device that is heated-up during operation. 
     Still another aspect of the present disclosure is to remove contaminants from target surfaces. 
     Another aspect of the present disclosure is to remove harmful gases released by the UV lamp during operation. 
     Yet another aspect of the present disclosure is to provide a unified airflow system that is compatible with different configurations of a connected airflow accessory. 
     Still another aspect of the present disclosure is to provide autonomous surface decontamination through vacuum cleaning and UV disinfection. 
     Another aspect of the present disclosure is decontamination of surfaces, which are at a significant height from the ground. 
     Yet another aspect of the present disclosure is to provide effective surface disinfection through prior removal of contaminants from a surface. 
     Still another aspect of the present disclosure is to decontaminate and disinfect surfaces on the ground and proximate thereto. 
     The above summary of exemplary embodiments is not intended to describe each disclosed embodiment or every implementation of the present disclosure. Other and further aspects and features of the disclosure will be evident from reading the following detailed description of the embodiments, which are intended to illustrate, not limit, the present disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The illustrated embodiments of the subject matter will be better understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and processes that are consistent with the subject matter as described herein. 
         FIG.  1    is a front elevation view of an area ultraviolet (UV) disinfection device including an exemplary unified airflow system, according to an embodiment of the present disclosure illustrating a cabinet and an articulated head assembly in an open position. 
         FIG.  2    is a right-side elevation view of the area UV disinfection device of  FIG.  1   , according to an embodiment of the present disclosure. 
         FIG.  3    is a left-side elevation view of the area UV disinfection device of  FIG.  1   , according to an embodiment of the present disclosure. 
         FIG.  4    is a front isometric view of the area UV disinfection device of  FIG.  1    illustrating the right-side of the area UV disinfection device, according to an embodiment of the present disclosure. 
         FIG.  5    is a front isometric view of the area UV disinfection device of  FIG.  1    illustrating the left-side of the area UV disinfection device, according to an embodiment of the present disclosure. 
         FIG.  6    is a rear elevation view of the area UV disinfection device including an exemplary fixed airflow accessory for being used with the unified airflow system of  FIG.  1   , according to an embodiment of the present disclosure. 
         FIG.  7    is a rear isometric view of the area UV disinfection device of  FIG.  6    illustrating, the right-side of the area UV disinfection device, according to an embodiment of the present disclosure. 
         FIG.  8    is a rear isometric view of the area UV disinfection device of  FIG.  1    illustrating the left-side of the area UV disinfection device with a dismounted fixed airflow accessory of  FIG.  6   , a portion of the cabinet removed from the head assembly, and without the utility pods, according to am embodiment of the present disclosure. 
         FIG.  9    is a front elevation view of an exemplary wearable airflow accessory for the unified airflow system of  FIG.  1   , according to an embodiment of the present disclosure. 
         FIG.  10    is a left-side elevation view of the wearable airflow accessory of  FIG.  9   , according to an embodiment of the present disclosure. 
         FIG.  11    is a rear isometric view of the area UV disinfection device of FIG. I illustrating the wearable airflow accessory of  FIG.  9    being detachably mounted on the UV disinfection device and utility pods removed therefrom, according to an embodiment of the present disclosure. 
         FIG.  1    is a cross-sectional view of the wearable airflow accessory of  FIG.  9    taken along the line A-A of  FIG.  9   , according to an embodiment of the present disclosure. 
         FIG.  13    is a front elevation view of an exemplary cleaning unit for the wearable airflow accessory of  FIG.  9   , according to an embodiment of the present disclosure. 
         FIG.  14    is a left-side elevation view of the cleaning unit of  FIG.  13   , according to an embodiment of the present disclosure. 
         FIG.  15    is a left-side elevation view of a detached configuration of the cleaning unit of  FIG.  13   , according to an embodiment of the present disclosure. 
         FIG.  16    illustrates a block diagram of an exemplary implementation of the unified airflow system of  FIG.  1    with the area UV disinfection device of  FIG.  1   , according to an embodiment of the present disclosure. 
         FIG.  17    is a front isometric view of a first configuration of an exemplary unified airflow assembly for the unified airflow system of  FIG.  16    illustrating the unified airflow assembly mounted on a chassis of the area UV disinfection device of  FIG.  1   , according to an embodiment of the present disclosure. 
         FIG.  18    is a left-side elevation view of the unified airflow assembly of  FIG.  17   , according to an embodiment of the, present disclosure. 
         FIG.  19    is a rear isometric view of an exemplary unified airflow assembly of FIG.  17  mounted on the area UV disinfection device of FIG. . 1 , according to an embodiment of the present disclosure. 
         FIG.  20    is a rear isometric view of the head assembly of the area UV disinfection device of  FIG.  1    without the cabinet taken along the circle A of  FIG.  19   , according to an embodiment of the present disclosure. 
         FIG.  21    is a rear isometric view of the unified airflow assembly of  FIG.  17    illustrating the fixed airflow accessory of  FIG.  6   , according to an embodiment of the present disclosure. 
         FIG.  22    is a right-side elevation view of the unified airflow assembly of  FIG.  17    removed from the chassis, according to an embodiment of the present disclosure. 
         FIG.  23    is a rear elevation view of the unified airflow assembly of  FIG.  22   , according to an embodiment of the present disclosure. 
         FIG.  24    is a cross-sectional view of the unified airflow assembly of  FIG.  22    taken along the line G-G of  FIG.  23   , according to an embodiment of the present disclosure, 
         FIG.  25    is an exploded view of an exemplary second configuration of the unified airflow assembly of  FIG.  16   , according to an embodiment of the present disclosure. 
         FIG.  26    is a schematic illustrating an exemplary airflow regulator for the unified airflow assembly of  FIG.  25   , according to an embodiment of the present disclosure. 
         FIG.  27    is a schematic illustrating alternative configuration of the unified airflow assembly of  FIG.  26   , according to an embodiment of the present disclosure. 
         FIG.  28    is a front isometric view of an exemplary third configuration of the unified airflow assembly of  FIG.  16    mounted on the, chassis of the area UV disinfection device of  FIG.  1   , according to an embodiment of the present disclosure. 
         FIG.  29    is a rear isometric view of the unified airflow assembly of  FIG.  28   , according  10  an embodiment of the present disclosure. 
         FIG.  30    is a right-side elevation view of the unified airflow assembly of  FIG.  28    removed from the chassis, according to an embodiment of the present disclosure. 
         FIG.  31    is a rear elevation view of the unified airflow assembly of  FIG.  30   , according to an embodiment of the present disclosure. 
         FIG.  32    is a cross-sectional view of the unified airflow assembly of  FIG.  30    taken along the line E-E of  FIG.  31   , according to an embodiment of the present disclosure 
         FIG.  33    is a schematic illustrating an exemplary fourth configuration of the unified airflow assembly of  FIG.  16   , according to an embodiment of the present disclosure. 
         FIG.  34    is a schematic illustrating alternative configuration of the unified airflow assembly of  FIG.  33   , according to an embodiment of the present disclosure. 
         FIGS.  35 - 36    illustrate an exemplary method of using the unified airflow assembly of  FIG.  17    implemented on the UVD device of  FIG.  1   , according to an embodiment of the present disclosure. 
         FIGS.  37 - 38    illustrate an exemplary method of using the unified airflow assembly of  FIG.  25    implemented on the UVD device of  FIG.  1   , according to an embodiment of the present disclosure. 
         FIGS.  39 - 40    illustrate an exemplary method of using the unified airflow assembly of  FIG.  28    implemented on the UVD device of  FIG.  1   , according to an embodiment of the present disclosure. 
         FIGS.  41 - 42    illustrate an exemplary method of using the unified airflow assembly of  FIG.  33    implemented on the IIVID device of  FIG.  1   , according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The following detailed description is provided with reference to the figures. Exemplary embodiments are described to illustrate the disclosure, not to limit its scope, which is defined by the claims. Those of ordinary skill in the art will recognize number of equivalent variations in the description that follows without departing from the scope and spirit of the disclosure. 
     Non-Limiting Definitions 
     Definitions of one or more terms that will be used in this disclosure are described below without limitations. For a person skilled in the art, it is understood that the definitions are provided just for the sake of clarity and are intended to include more examples than just provided below. 
     A “ultraviolet disinfection device” is used in the present disclosure in the context of its broadest definition. The ultraviolet (UV) disinfection device may refer to a standalone or a networked electronic or electromechanical device capable of providing pulses o ultraviolet (UV) radiation of a desired intensity, dose or frequency within the germicidal wavelength range of the UV spectrum for disinfection. 
     “Decontamination” is used in the present disclosure in the context of its broadest definition. The decontamination may refer to removal or neutralization of unwanted substances from a target surface or enveloping atmosphere. 
     “Disinfection” is used in the present disclosure in the context of its broadest definition. The disinfection may refer to any process of inactivating or killing pathogens on a target surface using UV light alone or in combination with a variety of disinfectants known in the art, related art, or developed later including, but not limited to, chemical agents (e.g., alcohols, aldehydes, oxidizing agents, naturally occurring or modified compounds, etc.), physical agents (e.g., heat, pressure, vibration, sound, radiation, plasma, electricity, etc.), and biological agents (e.g., living organisms, plants or plant products, organic residues, etc.). 
     A “cleaning unit” is used in the present disclosure in the context of its broadest definition. The cleaning unit may refer to a networked, interconnected or a standalone device capable of using fluid, pressure either alone or in combination with one or more cleaning agents to decontaminate a surface. Examples of cleaning agents may include, but not limited to, chemical agents, physical agents, and biological agents such as those mentioned above. 
     A term “proximal” is used in the present disclosure in the context of its broadest definition. The term “proximal” may refer to a side, end, portion, section, location, direction, position, or any other aspect being relatively farthest from a UV lamp in communication with the UV disinfection device. 
     A term “distal” is used in the present disclosure in the context of its broadest definition., The term “distal” may refer to a side end, portion, section, location, direction, position, or any other aspect being relatively closest to the UV lamp in communication with the UV disinfection device. 
     A term “airflow accessory” is used in the present disclosure in the context of its broadest definition. The airflow accessory may represent any powered or non-powered device capable of managing or manipulating flowrate, direction, physical properties (e.g., temperature, pressure, weight or mass, volume, velocity, concentration, electric charge, viscosity, etc.) or chemical properties (e.g., enthalpy, toxicity, pH value, reactivity, flammability, etc.) of a fluid, or any of its constituents, such as air for an intended purpose. 
     Overview 
     Embodiments of the, present disclosure describe a UV disinfection device including a unified airflow system that supports an airflow accessory such as a cleaning unit of any configuration and cook a UV light source, such as a UV lamp emitting the UV light for disinfection. The unified airflow system includes a control unit and a unified airflow assembly having an airflow regulator and a vacuum pump. The airflow regulator may be coupled to a vacuum pump creating a suction airstream. The airflow regulator provides a shared air passage between the UV lamp and the airflow accessory configured to use the suction airstream for decontaminating a surface, where the UV lamp and the airflow accessory are fluidically disconnected from each other. The airflow regulator includes at least one air restriction unit being controlled by the control unit to selectively establish a fluid communication between the vacuum pump and either the UV lamp or the airflow accessory using one or more hoses. The air restriction unit facilitates the hot air around the UV light source being drawn using the suction airstream while preventing an unclean air from the airflow accessory front moving across to the UV lamp, and vice versa. 
     Exemplary Embodiments 
     The present disclosure is described below in detail with reference to the drawings, which are provided as illustrative examples so as to enable those skilled in the art to practice the disclosure. Moreover, where certain elements of the present disclosure can be partially or fully implemented using known components, only those portions of such known components that are necessary for an understanding of the present invention will be described, and detailed descriptions of other portions of such known components will be omitted. In the present specification, an embodiment showing a singular component should not be considered limiting; rather, it is intended to encompass other embodiments including a plurality of the same component, and vice-versa, unless explicitly stated otherwise herein. 
       FIGS.  1 - 5    illustrate an area ultraviolet disinfection device including an exemplary unified airflow system, according to an embodiment, of the present disclosure. Embodiments are disclosed in the context of contact and contactless surface decontamination of a large area such as a hospital room. However, in general, such and further embodiments of the present disclosure may be applied in other environments including, but not limited to, clinics, food processing facilities, cruise ships, homes, schools, factories, restaurants, ambulances, locker rooms, and gyms. 
     The area UV disinfection device  10  (or UVD device  10 ) may represent a wide variety of devices configured to emit or facilitate emission of UV pulses having predetermined characteristics suitable to induce an intended effect (e.g., disinfection, curing, sintering, etc.) on a surface in a short period (e.g., approximately 10 minutes or less) from a relatively long distance (e.g., greater than approximately  1  meter from the surface). Examples of these characteristics include, but are not limited to, energy, frequency, power, wavelength, and dose. The UVD device  10  may be implemented to include hardware and installed software, where is closely matched to the requirements and/or functionality of the hardware. In some instances, the UVD device  10  may enhance or increase the functionality and/or capacity of a network (not shown) to which it may be connected. 
     The network may include any software, hardware, or computer applications that can provide a medium to exchange signals or data in any of the formats known in the art, related art, or developed later. The network may include, but is not limited to, social media platforms implemented as a website, a unified communication application, or a standalone application. Examples of the social media platforms may include, but are not limited to. Twitter™. Facebook™, Skype™, Microsoft Lyne™. Cisco Webex™, and Google Hangouts™. Further, the network may include, for example, one or more of the Internet, Wide Area Networks (WANs), Local Area Networks (LANs), analog or digital wired and wireless telephone Networks (e.g., a PSTN, Integrated Services Digital Network (ISDN), a cellular network, and Digital Subscriber Line (xDSL), radio, television, cable, satellite, and/or any other delivery or tunneling mechanism for carrying data. The network may include multiple networks or sub-networks, each of which may include, e.g., a wired or wireless data pathway. The network may include a circuit-switched voice network, a packet-switched data network, or any other network able to carry electronic communications. For example, the network may include networks based on the Internet protocol (IP) or asynchronous transfer mode (ATM), and may support voice using, for example, VoIP, Voice-over-ATM, or other comparable protocols used for voice, video, and data communications. 
     The UVD device  10  may also include software, firmware, or other resources that support remote administration, operation, diagnostics, repair, and/or maintenance thereof. Further, the UVD device  10  may be implemented in communication with any of a variety of computing devices such as a desktop PC, a personal digital assistant (PDA), a server, a mainframe computer, a mobile computing device (e.g., mobile phones, laptops, etc.), an internet appliance (e.g., a DSL modem, a wireless access point, a router, a base station, a gateway, etc.), and so on. In some instances, the UVD device  10  may operate, or cease to operate, in response to a wearable device including, but not limited to, a fashion accessory (e.g., a wristband, a ring, etc.), a utility device (hand-held baton, a pen, an umbrella, a watch, etc.), a body clothing, or any combination thereof, present within a predetermined proximity of, or remotely connected to, the UVD device  10 . 
     The UVD device  10  either independently or in communication with a network device may have video, voice, or data communication capabilities (e.g., unified communication capabilities) by being coupled to or including, various imaging devices (e.g., cameras, printers, scanners, medical imaging systems, etc.), various audio devices (e.g., microphones, music players, recorders, audio input devices, speakers, audio output devices, telephones, speaker telephones, etc.), various video devices (e.g., monitors, projectors, displays, televisions, video output devices, video input devices, camcorders, etc.), or any other type of hardware, in any combination thereof. In some instances, the UVD device  10  may comprise or implement one or more real-time protocols and non-real-time protocols known in the art, related art, or developed later to facilitate data transfer to the networked device. 
     In one embodiment, the UVD device  10  may include a mobile carriage  15 , a cabinet  20 , a first utility pod  25 - 1 , a second utility pod  25 - 2 , a head assembly  30 , a UV lamp  35 , a unified airflow system  40 , a display unit  45 , and an, airflow accessory  50 . The mobile carriage  15  may provide a platform for supporting various components such as the cabinet  20  and the UV lamp  35  of the UVD device  10 . The mobile carriage  15  may include mobility devices, which may assist to drive the mobile carriage  15  on an intended surface such as a floor based on friction, magnetic levitation, cryogenic levitation, or any other motion principle known in the art. related art, or developed later. For example, the mobile carriage  15  may include omnidirectional wheels  55 - 1  and  55 - 2  for navigating the UVD device  10  with precision to any desired location within a designated space such as a hospital room. The mobile carriage  15  may be controlled remotely by any computing device known in the art, related art, or developed later such as those mentioned above over the network. In some instances, the mobile carriage  15  may be configured to operate or move autonomously. For example, the mobile carriage  15  may be fitted with electric motors connected to the mobility devices, where the electric motors may be controlled remotely via a control box such as a control unit  150 , discussed in detail below. The mobile carriage  15  may be partially or fully enclosed in the cabinet  20 . 
     The cabinet  20  may refer to any housing configured to substantially cover the mobile carriage  15  and protect various components mounted thereon. In some instances, the cabinet  20  may improve the aesthetics of the UVD device  10 . The cabinet  20  may be made of any durable, fire-retardant or fire-resistant, and light-weight polymers known in the art, related art, or developed later including, but not limited to, polyphenylene sulfide, polyamide-imide, polypropylene, and aramid polyamide polymers. The cabinet  20  may include components or pockets that may be permanently connected, detachably coupled, or integrally formed thereto, based on intended purposes. For example ( FIGS.  2 - 3   ), the cabinet  20  may include a handle  100  for enabling a user to manually maneuver the UVD device  10  from one place to another. In another example, one or more utility pods such as the first utility pod  25 - 1  and the second utility pod  25 - 2  (collectively, pods  25 ) may be attached externally to the cabinet  20 , allowing for convenient on-board carrying of various tools, supplies and implements, such as wands, mop head/handles, boxes of wet-wipes or mop-refills, etc. Structurally, such pods  25  may be hollow tridimensional structures, with at least one staple opening and rigid or semi-rigid walls. In some instances, such staple opening may face generally upwards or at a predetermined angle for easy access. 
     The pods  25  may have any of a variety of shapes such as a rectangular prismatic (or oval prismatic) shape, which may be either attached to the cabinet  20  at various suitable positions or may be pre-molded (or preformed) onto the cabinet  20  at the cabinet manufacturing stage, Functionally, such pods  25  may serve to hold (or stow) various tools, supplies and implements, such as wands, mop heads/handles, boxes of wet-wipes or mop-refills, cleaning supplies, etc. in a proximity which gives convenience and easy reach to a human operator, These pods  25  may have different structural configurations. For example, the first utility pod  25 - 1  may be a shorter (less deep) and wider pod, e.g., suitable for boxes of mop heads, boxes of wet-wipes or mop-refills, cleaning supplies, short wands, short-handled cleaning implements, handheld vacuum cleaners, etc. By contrast, the second utility pod  25 - 2  may be a relatively longer (deeper) pod, suitable for stowing longer and/or narrower implements, such as long wands and long mop-handles. Other structural configurations may include the pods  25  having any suitable dimensions, structures, or shapes depending on items intended to be carried or engaged therewith. Such pods  25  may be placed in any suitable position, e.g., outside (or extending towards inside) the cabinet  20 , provided such placement does not interfere with the intended functionality of the UVD device  10 . 
     Various other kinds, sizes, and shapes of utility pods  25  may also be contemplated based an intended purpose or items to be held therein, such as refuse-holding pods, pods for dirty (or used) wipes, pods for holding various tools and electrical cords, pods with optional lids and liners, pods for documents and paperwork, pods with openings both at the top and at the bottom, pods placed entirely or partially within the inside volume of cabinet  20 , etc. The pods  25  may he made of any suitable material known in the art, related art, or developed later including those described above for the cabinet  20 , such that the material has suitable rigidity, mechanical tolerance, and resistance to the UV light or various other types of decontamination and disinfection agents known in the art, related art, or developed later. Adjacent to the pods  25  ( FIGS.  4 - 5   ), the cabinet  20  may include a recess  60  for receiving the head assembly  30 , or a portion thereof, in a retracted position. However, other suitable locations may be contemplated for the recess  60  on the cabinet  20  based on functional and structural configurations of the head assembly  30 . 
     The head assembly  30  may be supported on the mobile carriage  15  and secured to a vertical journal  65 , which may be selectively rotated by a motor (not shown), thereby allowing the head assembly  30  to follow a panning motion about a vertical axis in an open position, as illustrated. The vertical journal  65  may be connected to a motorized tilt mechanism  62 , which may rotate about a horizontal axis parallel to the floor for selectively pivoting the head assembly  30  from the open position to a retracted position (not shown), and vice versa. The motorized tilt mechanism  62  in combination with the vertical journal  65  may allow precise pan, swivel, tilt, and rotatory movements of the head assembly  30 . In the retracted position, the head assembly  30  may be seated within the recess  60  of the cabinet  20 . 
     In one embodiment, the head, assembly  30  may include the UV lamp  35  configured to orient in different directions for projecting the UV light depending on the movement of the head assembly  30 . For example, in the illustrated open position, the head assembly  30  may move out of the recess  60  and tilt to a predetermined angle with respect to the horizontal axis for allowing the UV lamp  35 , upon activation, to project the UV light through a quartz window  67  in a front panel  69  of the head assembly  30 . Such tilt of the head assembly  30  may depend on the height of a target surface from the ground. For example, the head assembly  30  may be tilted, substantially downwards about the horizontal axis for the UV lamp  35  to project the UV light through the quartz window  67  on to the ground and/or surfaces proximate thereto, e.g., zero to approximately 2 feet from the ground. In another example, the head assembly  30  may be tilted substantially upwards about the horizontal axis for the UV lamp  35  to project the UV light through the window  67  on to a ceiling and/or surfaces proximate thereto such as 8 feet to 10 feet from the ground. Other examples may include the head assembly  30  being tilted to fixed or gradually changing angles for projecting the UV light on target surfaces at a substantial height, e.g., approximately 2 feet to approximately 8 feet, from the ground. 
     Further, in the retracted position of the head assembly  30 , the UV lamp  35  may be deactivated; however, some embodiments may include the UV lamp  35  being configured to emit the UV light to a predetermined site within the UVD device  10  in such retracted position. In some other embodiments may include movement and orientation of the UV lamp  35  being independent of the movement of the head assembly  30 . Further embodiments may include additional UV sources such as the UV lamp  35  enclosed in a housing and placed at other suitable locations on the UVD device  10 . Examples of these locations may include, but not limited to, outer surface of the cabinet  20  and the mobile carriage  15 . 
     The UV lamp  35  may be of any suitable type known in the art, related art, Or developed later including a mercury-vapour UV lamp  35 , a pulsed Xenon UV lamp  35 , and a continuous UV lamp  35 , The UV lamp  35  may be configured to irradiate timed pulses of UV light with each pulse having predefined characteristics such as energy, power, wavelength, and frequency according to an intended application such as disinfection and a distance between the UV lamp  35  and a target surface. For example, the UV lamp  35  may be controlled by the control unit  150  to emit 30 to 1500 Joules of energy per pulse of UV light at a predefined frequency ranging from 2-100 Hz for a distance of approximately 1 to approximately 3 meters between the UV lamp  35  and a target surface. Other suitable pulse characteristics may be contemplated for effective disinfection at greater distances from the target surface. Such pulse characteristics and other aspects (e.g., operational duration, temperature, ozone gas Concentration, etc.) of the UV lamp  35  may be displayed on the display unit  45 , discussed below, in communication with the UVD device  10 . 
     In one embodiment, the head assembly  30  may be in flow communication with the unified airflow system  40  configured for manipulating a fluid pressure to assist decontamination of regions internal as well as external to the UVD device  10 . The unified airflow system  40  may establish a selective flow communication between sites inside and outside the UVD device  10 . The unified airflow system  40  may be further configured to (1) provide a common or shared fluid passage between a predetermined site and various other sites, which may be fluidically disconnected from each other, and (2) manipulate the pressure or direction of a circulating fluid such as air between the predetermined site and those other sites. 
     Further, in the illustrated embodiment ( FIGS.  6 - 7   ), the UVD device  10  may further include the display unit  45  located on the cabinet  20 ; however, other embodiments may include the display unit  45  connected remotely to the UVD device  10  over the network. The display unit  45  may be in communication with a user interface. (not shown) indicating information pertaining to the operation of UVD device  10 . Different types of user interfaces, including those, which are touch controlled, key-controlled, joystick-controlled, motion-controlled, voice-controlled, and so on may be employed. The user interface may be either integrated or separately combined with the display unit  45  or the device  10 , which may also include a variety of known, related art, or later developed interface(s), including software interfaces (e.g., an application programming interface, a graphical user interface, etc.); hardware interfaces (e.g., cable connectors, a keyboard, a card reader, a barcode reader, a biometric scanner, an interactive display screen, a printer, temperature sensors, light sensors, disinfection sensor, etc.); or both. Such interface(s) may facilitate communication between various devices such as the head assembly  30 , the unified airflow system  40 , the airflow accessory  50 , or any other component or device associated with the UVD device  10 . In, some embodiments, the interface(s) may facilitate communication with other networked devices capable of interacting with the UVD device  10  over the network. 
     In one embodiment, the display unit  45  may be or include an interactive display screen allowing an operator to access, control, or dynamically define different functionalities (e.g., automatic spatial movement of the UVD device  10 , dynamic pathogen detection or identification, etc.) of the UVD device  10 . In one example, the display unit  45  may display a login/logout section and a dashboard. The login/logout section may allow an operator to selectively gain access for using the UVD device  10 . Upon being logged-in, the display unit  45  may display the dashboard providing a list of functionalities, modes, parameters, avatars, etc. that the operator may select or modify for a desired operation of the UVD device  10 . Other embodiments may include the display unit  45  including or providing a variety of tangible indicators (e.g., light emitting diodes, vibrators, speakers, etc.) or virtual indicators displayable on the dashboard (e.g., numeric indicators, alphanumeric indicators, or non-alphanumeric indicators, such as different colors, different color luminance, different patterns, different textures, different graphical objects, etc.) known in the art, related art, or developed later to indicate different aspects of the UVD device  10 . Examples of these aspects may include, but not limited to, values of operational parameters such as frequency, wavelength, dose, power, and energy; a selected mode in operation; operational states of different components; and operation or performance aspects of a networked or physically connected accessory. 
     In one embodiment, the UVD device  10  may include the airflow accessory  50  configured to operate in communication with the unified airflow system  40 . The airflow accessory  50  may represent any powered Or non-powered fluid management device capable of managing or manipulating flowrate, direction, physical properties (e.g., temperature, pressure, weight or mass, volume, velocity, concentration, electric charge, viscosity, etc.) or chemical properties (e.g., enthalpy, toxicity, pH value, reactivity, flammability, etc.) of a fluid such as air, or any of its constituents, for an intended purpose. The airflow accessory  50  may be connected fluidically to the unified airflow system  40  depending on its structural or functional configuration. 
     The airflow accessory  50  may be adapted to have a variety of configurations. In a first configuration ( FIGS.  6 - 8   ), the airflow accessory  50  may be configured as a fixed unit (hereinafter interchangeably referred to as fixed accessory) for being permanently connected to the cabinet  20  by screws  70 - 1 .  70 - 2 ,  70 - 3 , and  70 - 4 . However, other suitable connection mechanisms known in the art, related art, or developed later including welding and gluing may be contemplated depending on materials from which the airflow accessory  50  and the cabinet  20  are made. The fixed accessory may be mounted at any suitable location away from a projection side of the cabinet  20 . The projection side may refer to any location on the cabinet  20  which can fall in the path or plane of UV light emitted by the UV lamp  35  during operation in the open position of the head assembly  30 . For example, the fixed accessory may be mounted on a rear side of the cabinet  20 , where the rear side may be located behind the front panel  69  of the head assembly  30 . Such mounting of the fixed accessory away from the projection side may prevent a human Operator of the fixed accessory from being exposed to the UV light in the event of unintentional activation of the UV tamp  35 . Alternatively, the fixed accessory or Structural aspects thereof may be formed integral to a portion of the cabinet  20 . The fixed accessory may be made of any suitable rigid or semi-rigid materials known in the art, related art, or developed later. Examples of such materials may include metals, polymers, composites, alloys, or the like. In one embodiment, the fixed accessory may be configured as a cleaning accessory including a cleaning unit  110  capable of collecting and storing contaminants such as dirt and debris using the unified airflow system  40 , discussed below in further details. The fixed accessory, or the cleaning unit  110  therein, may also include a fixed accessory hose  75  extending proximally out from the body of the fixed accessory. The fixed accessory hose may  75  allow an operator to guide the airflow through the fixed accessory in different directions for an intended purpose. For example, the fixed accessory hose  75 , directly or with a hose extension kit, may assist to use the airflow provided by the unified airflow system  40  to decontaminate surfaces at a significant height such as approximately  2  feet or more from the ground. Examples of such surfaces may include, but not limited to, door knobs, wall décor, ceilings and hanging light fixtures therefrom, etc. Other examples may include the fixed accessory hose  75  being used to access surfaces at a height of less than approximately 2 feet from the ground for decontamination. In some embodiments, the airflow accessory may be powered or controlled by components/devices in physical or network connection with the UVD device  10 . 
     In a second configuration (Ha  9 ), the airflow accessory  50  may be adapted to have any suitable shape, design, and geometry for being worn by an operator during use. For example, such wearable airflow accessory  50 , hereinafter interchangeably referred to as wearable accessory, may be configured as a backpack or shoulder-type unit, whereby the operator may detach the wearable accessory from the cabinet  20  or the UVI) device  10  for use. The wearable accessory may include a hollow body  80  having openings (not shown) to receive a first set of hoses including a first proximal hose  85 - 1  and a first distal hose  85 - 2 . The first distal hose  85 - 2  may be connected to the unified airflow system  40  provide a fluid channel between the hollow body  80  and the unified airflow system  40 , discussed below in further details. On the other hand, similar to the fixed accessory hose  75 , the first proximal, hose  85 - 1 , directly or with a hose extension kit, may assist the operator to interact with surfaces at a significant height from the ground for an intended purpose. 
     The body  80  may include a pair of straps  90  and a loop  95  ( FIG.  10   ) for easy handling or carrying the wearable accessory. The straps  90  may allow an operator to wear the wearable accessory as a normal backpack or shoulder-mounted accessory during use and thereafter, put the wearable accessory back on the UVD device  10  by any suitable accessory support  105 . For, example ( FIG.  11   ), the handle  100  of the UVD device  10  may include a hook on which the wearable accessory may be hanged by the loop  95 . Other examples of such accessory support  105  may include, but are not limited to, a shelf-like structure coupled or attached to the cabinet  20  and an appropriately sized and shaped pod on the cabinet  20  in which the wearable accessory may be removably retained. The wearable accessory may be made of any suitable flexible or semi-rigid and light-weight materials known in the art, related art, or developed, later including polymers. In some embodiments, the wearable accessory may be detachably mounted on the cabinet  20  through a snap fit mechanism. Other suitable configurations known in the art, related art, or developed later including upright, cannister, robotic, and handheld configurations may also be contemplated for the airflow accessory  50 . 
     Further, the airflow accessory  50  may be adapted for an intended purpose. For example ( FIG.  12   ), the wearable accessory may include the cleaning unit  110  enclosed in the hollow-body  80  for surface decontamination. The cleaning unit  110  may be permanently connected, detachably installed, or formed integral to the body  80  of the wearable accessory. In one embodiment ( FIGS.  13 - 14   ), the cleaning unit  110  may be a separate equipment, which may be housed within the hollow body  80  of the wearable accessory. The cleaning unit  110  may represent any of a variety of equipment capable of using a fluid such as air for contaminant collection and filtrating the contaminated fluid after such collection to produce a relatively cleaner or clearer fluid. In some embodiments, the cleaning unit  110  may be designed for being used without the, airflow accessory  50  and used directly with the unified airflow system  40 . The cleaning unit  110  may have any suitable shape, dimensions, or configurations depending on the desired ability to remove or collect intended contaminants such as dirt, dust, debris, and fluid waste. 
     In one embodiment ( FIG.  15   ), the cleaning unit  110  may include a dirt collection unit  115  and a filtration unit  120 , The dirt collection unit  115  may refer to any component or device known in the art, related art, or developed later including, but not limited to, a porous bag, a filter, or a combination thereof, capable of collecting and/or storing solid or semi-solid contaminants while allowing an intended fluid such as air, or a specific gas, to pass therethrough. Examples of materials for the porous bag may include, but are not, limited to, natural or synthetic fibers; polycomposites; foam, meshed or electrostatic paper; or any other suitable materials known in the art, related art, or developed later. The dirt collection unit  115  may be permanently connected, detachably coupled, or formed integral with a second proximal hose  125  (and/or with a hose extension kit) using any of the variety of connection mechanisms known in the art. Examples of these connection mechanisms include, but are not limited to, welding, molding, a snap fit, a screw fit, a leer-lock, and gluing, which may be chosen depending on the materials from which the dirt collection unit  115  and the second proximal hose  125  may be made. In the illustrated embodiment, the dirt collection unit  115  may be detachable from the cleaning unit  110  to assist in removing the contaminants collected therein; however, other embodiments may include the dirt collection unit  115  being integrated with the cleaning unit  110  and having a closeable opening for removing the collected contaminants. 
     The filtration unit  120 , on the other hand, may be permanently connected, detachably coupled, or formed integral with a second distal hose  130  (and/or with a hose extension kit) using any of the variety of connection mechanisms such as those mentioned above depending on the materials from which the filtration unit  120  and the second distal hose  130  may be made. The filtration unit  120  may include an accessory filter  135 , or a combination of different filters, such as those mentioned above for filtering the fluid such as air passing through the dirt collection unit  115 . In the illustrated embodiment, the accessory filter  135  may be a high efficiency particulate air (HEPA) filter for filtering the air received through the dirt collection unit  115 . Other examples of the accessory filter  135  may include, but are not limited to, ultra-low penetration air (ULPA) filters, Micro Fresh filters, allergen filters, and carbon-activated filters. 
     In some embodiments, the cleaning unit  110  may be integrated with the airflow accessory  50  such as the fixed accessory and the wearable accessory. One having ordinary skill in the art would understand that when the cleaning unit  110  is integrated with the wearable accessory, only one of the first set of hoses and, a second set of hoses, which includes the second proximal hose  125  and the second distal hose  130 , may be employed. Similar adjustments may be contemplated when integrating the cleaning unit  110  with the fixed accessory, e.g., the second distal hose  130  may be removed from the cleaning unit  110  and directly fitted to the unified airflow system through the airflow accessory  50 . References to the airflow accessory  50  made hereinafter will refer to a configuration of the airflow accessory  50  which is integrated with the cleaning unit  110  for removing contaminants. 
     Further, each of the fixed accessory hose  75 , the first proximal hose  85 -i, and the second proximal hose  125 , and/or with a hose extension kit, (collectively, set of proximal hoses) may enable an operator to effect cleaning within a reasonable radius depending on the airflow accessory  50  being mounted to or detached from the cabinet  20 . Each hose in the set of proximal hoses may have a free-end configured for being coupled to one or more attachments such as an accessory attachment  140 . Examples of the accessory attachment may include a nozzle, a brush, a hose, or any other suitable attachments known in the art, related art, or developed later. In some embodiments, the set of proximal hoses may be configured to suitably manipulate the fluid passage therethrough to increase or decrease the speed or, pressure of a passing fluid such as air based on the Bernoulli&#39;s principle. In some other embodiments, the airflow accessory  50  may be a standalone vacuum cleaner which may be configured to operate in tandem with an airflow from the unified airflow system  40 . In further embodiments, the set of proximal hoses may include a UV source (not shown) projecting pulsed-UV light of suitable pulse characteristics such as those mentioned above for an, intended purpose including, but not limited to, disinfection, curing, and sintering. 
     Other embodiments of the airflow accessory  50  or the cleaning unit  110  may be, additionally or alternatively, adapted for odor removal. For example, the airflow accessory  50  may include a first compartment in flow communication with or storing a reactive agent and a second compartment in flow communication with the unified airflow system  40 . Examples of the reactive agent may include, but not limited to, chemical agents (e.g., alcohols, aldehydes, oxidizing agents, naturally occurring or modified compounds, etc.), physical agents (e.g., heat, pressure, vibration, sound, radiation plasma, electricity, etc.), and biological agents (e.g., living organisms, plants or plant products, organic residues, etc.). Upon receiving a trigger from a control box such as a control unit  150  of the UVD device  10 , the airflow accessory  50  may operate the first compartment to controllably release the reactive agent for being mixed with a fluid such as air passing through the second compartment, The trigger may be any mechanical, chemical, electrical stimuli, or any combination thereof, capable of manipulating the first compartment to controllably release the reactive agent. Alternatively, the second compartment may be triggered to selectively combine the fluid such as air with the reactive agent in the first compartment. The trigger may be provided manually by an operator or automatically effected by the control unit  150  upon predefined or dynamically conditions such intended concentration of the reactive agent in the fluid. The mix of fluid and reactive agent may be released into the unified airflow system  40  or out of the airflow accessory  50  via a proximal hose such as the set of proximal hoses depending on a respective negative pressure or a positive pressure of airflow in the airflow accessory  50 . In some embodiments, the airflow accessory  50  such as a standalone vacuum cleaner may be configured to operate in, tandem with the unified airflow system  40 . 
     As illustrated in  FIG.  16   , in one embodiment, the unified airflow system  40  may be implemented in flow communication with the. UV lamp  35  and any suitable fluid management device, such as the airflow accessory  50 , compatible with the unified airflow system  40 ; however, the airflow accessory  50  and the UV lamp  35  may be kept fluidically disconnected from each other. The airflow accessory  50  may have any suitable configurations known in the art, related art, or developed later including the fixed accessory and the wearable accessory. In one embodiment, the unified airflow system  40  may include a unified airflow assembly  145 , the control unit  150 , and a power supply unit  155 . The control unit  150  may be any electronic or an electromechanical system configured to control predefined or dynamically defined functions and movements of various components including, but not limited to, the unified airflow assembly  145 , the mobile carriage  15 , the head assembly  30 , the UV lamp  35 , the motor, and the motorized tilt mechanism  62 . In some embodiments, the control unit  150  may include or be implemented by way of a single device (e.g., a computing device, processor or an electronic storage device) or a combination of multiple devices, The control unit  150  may be implemented in hardware or a suitable combination of hardware and software. The “hardware” may comprise a combination of discrete electronic or electromechanical components, an integrated circuit, an application-specific integrated circuit, a field programmable gate array, a digital signal processor, or other suitable hardware. The “software” may comprise one or more objects, agents, threads. lines of code, subroutines, separate software applications, two or more lines of code or other suitable software structures operating in one or more software applications. The control unit  150  and the unified airflow assembly  145  as well as various components of the UVD device  10  may be powered by the power supply unit  155  including any source of high voltage power supply known in the art, related art, or developed later. Examples of the power supply unit  155  may include, but not limited to, a set of one or more batteries placed on the chassis  180  and an external electrical outlet via a power cord, which may be stored on a retractable reel disposed inside the cabinet  20 . 
     The unified airflow assembly  145  configured to selectively decontaminate regions internal and external to the UVD device  10  via a shared air path. The, unified airflow assembly  145  may include an airflow regulator  160 , a vacuum pump  165 , and one or more filters. The airflow regulator  160  may be configured regulate a flow communication between the vacuum pump  165  and other sites in response to a trigger from the control unit  150 . For example, the airflow regulator  160  may regulate a flow communication between the vacuum pump  165  and the UV lamp  35  mutually exclusive to that between the vacuum pump  165  and the airflow accessory  50 . In some embodiments, the unified airflow assembly  145  may be adapted to prevent any fluid communication between a site proximate to the UV lamp  35  and any other site located internal or external to the UVD device  10 . The airflow regulator  160  may communicate with the vacuum pump  165  via a filtration compartment  170  including one or more filters to remove contaminants from a passing fluid such as air. The vacuum pump  165  may be connected to a discharge outlet to direct and discard incoming air from the UV lamp  35  or the airflow accessory  50 . The discharge outlet may direct the incoming air through a gas filter  175  before discharging the air into the ambient surrounding. This gas filter  175  may prevent left-over or fluidic contaminants such as unwanted gases such as ozone in the incoming air from being released into the ambient surroundings. Various aspects of the unified airflow system  40  and, configurations of the unified, airflow assembly  145  are described below in detail with respect to the UVD device  10  of  FIGS.  1 - 5   . 
     As illustrated in  FIGS.  17 - 20   , the unified airflow system  40  may be mounted on a chassis  180  of the UVD device  10 , where the chassis  180  may be attached to and supported by the mobile carriage  15 . Although components particularly pertaining to implement the unified airflow system  40  are illustrated, one having ordinary skill in the art would understand other components pertaining to various functionalities of the UVD device  10  may be mounted on the chassis  180 . 
     In one embodiment ( FIG.  17   ), the unified airflow system  40  including the control unit  150 , the power supply unit  155 , and the unified airflow assembly  145  may be mounted on the chassis  180 . In one example, the power supply unit  155  and the control unit  150  may he mounted on a lower section of the chassis  180  supported by the mobile carriage  15 . Such positioning of the power supply unit  155  and the control unit  150  may assist to balance the weight of the UVD device  10  during movement, and maneuvers: however, other suitable positions or orientations may also be contemplated. The control unit  150  may be configured to operate the UVD device  10  in one or more predefined modes such as a disinfection mode and a cleaning mode; however, one having ordinary skill in the art may contemplate to define and implement additional operational modes for the U VD device  10  or any of the components associated therewith. 
     In the disinfection mode, the control unit  150  may be configured to drive the unified airflow assembly  145  for establishing a fluid, communication with the UV lamp  35  for removing hot air containing ozone around the UV lamp  35  while restricting airflow to/from the airflow accessory  50 . In some embodiments, the control unit  150  may additionally disable the cleaning unit  110  during the disinfection mode. In the cleaning mode, the control unit  150  may be configured to drive the unified airflow assembly  145  to establish a fluid communication with the airflow accessory  50  for extracting contaminants such as dirt and debris from a target surface while restricting the fluid continuity to the UV lamp  35 . In, some embodiments, the control unit  150  may additionally disable the UV lamp  35  during the cleaning mode. The operator may select one of these modes either through an input device such as the display unit  45  implemented as an interactive display screen, which may be configured to operate in communication with the control unit  150 . Other examples of the input device may include, but are not limited to, a smartcard, a microphone, a stylus pen, a keyboard, a camera, a switch, a rotary knob, a computing device, or any other input device known in the art, related, or developed later. Alternatively, the operator may select these modes remotely using a computing device such as those mentioned above in communication with the control unit  150  over the network. 
     As shown in  FIG.  18   , the unified airflow assembly  145  may have various components including the airflow regulator  160 , a UV hose  185 - 1  and an accessory hose  185 - 2  (collectively hoses  185 ), the vacuum pump  165 , and a discharge hose  190  providing the discharge outlet. Each of these components may be manufactured separately and then assembled together. Alternatively, each of the hoses  185  may be integrated with the airflow regulator  160  to create a first part, which may be manufactured as a single unit. Similarly, the vacuum pump  165  May be integrated with the discharge hose  190  to create a second part, which may be manufactured as a single unit. The first part may then be detachably coupled to the second part for forming the unified airflow assembly  145 . Such modular approach to removably assembling various components of the unified airflow assembly  145  may allow for easy replacement in case of any of these components become faulty. The airflow regulator  160  coupled to the hoses may he positioned on a top shelf of the chassis  180 , e.g., above the control unit  150  and the power supply unit  155 , for easy connectivity with predetermined sites. 
     The airflow regulator  160  may be configured to selectively regulate an airflow between the vacuum pump  165  and a predetermined site, e.g., the cleaning unit  110 , relative to another site such as the head assembly  30  including the UV lamp  35 . The airflow regulator  160  may be made of a single-piece or multiple pieces assembled together to create a substantially hollow regulator body including multiple openings and one or more air restriction units, which may toggle the airflow through each of those openings between the UV lamp  35  and the airflow accessory  50 . In some embodiments, the number of openings may be based on the number of sites to be fluidically connected to the vacuum pump  165  or the number of shared fluid paths. The regulator body may have a variety of shapes, configurations, and dimensions suitable for the airflow regulator  160  to be (i) secured at a predetermined location within the UVD device  10 , and (ii) create a predetermined amount of air pressure at the openings and in the hoses connected or coupled to those openings of the airflow regulator  160 . The regulator body may be made up of any suitable material configured to withstand a predetermined amount of pressure and temperature that may develop inside or outside the airflow regulator  160 . Exemplary materials for the body may be rigid, flexible, or semi-rigid materials including, but not limited to, metals, polymers, composites, alloys, or any other suitable material known in the art, related art, or developed later. 
     First Configuration of the Airflow Regulator 
     The airflow regulator  160  may have any suitable configurations based on the number of sites to be decontaminated and the desired number of shared fluid paths. For example, in a first configuration ( FIGS.  17 - 19   ), the airflow regulator  160  may have a substantially Y-configuration for being fluidically connected to two predetermined sites such as the head assembly  30  and an airflow accessory  50 . The airflow regulator  160  may have a substantially Y-shaped, rigid, hollow body including a first side arm  195 - 1 , a second side arm  195 - 2  (collectively referred to as side arms  195 ), and a central arm  200 . The first side arm  195 - 1  may be at a predetermined angle with respect to the second side arm  195 - 2 . In one example, the first side arm  195 - 1  may be perpendicular to the second side arm  195 - 2 . In another example, an angle between the side arms  195  may be less than, ninety degrees. The first side arm  195 - 1  may be coupled to the accessory hose  185 - 2 , which may have a first open end  205  extending to the rear side of the UVD device  10 . The first open end  205  may be secured to a portion of the chassis  180  or the mobile carriage  15  for easy connection with a connectable accessory. For example ( FIG.  21   ), the fixed accessory may include an opening (not shown) for being coupled to the accessory hose  185 - 2  via the first open end  205  using any suitable connection mechanisms. Examples of the connection mechanisms may include, but not limited to, welding, molding, a snap fit, a screw fit, a liter-lock, and gluing, which may be chosen depending on the materials from which the fixed accessory may be made. Similarly, the accessory hose  185 - 2  may be coupled to the first, distal hose  85 - 2  of the wearable accessory or the second distal hose  130  of the cleaning unit  110 . On the other hand, the second side arm  195 - 2  may be coupled to the UV hose  185 - 1 , which may extend to the head assembly  30  ( FIG.  20   ) and have a second open end  210  proximate to the UV lamp  35  ( FIG.  17   ). In some embodiments, the first open end  205  may be coupled to a set of multiple hoses or a single hose having multiple openings (not shown) attached to the mobile carriage l 5  and oriented towards the floor. 
     Further, as shown in  FIG.  19   , the unified airflow assembly  145  may include the vacuum pump  165 , whose one end may be coupled to the airflow regulator  160  from under the top shelf and the other end may he, coupled to the discharge hose  190 . The vacuum pump  165  may be of any suitable type known in the art, related art, or developed later. Examples of the vacuum pump  165  include, but are not limited to, a flow-through pump, a peripheral bypass pump, and a tangential bypass pump. The discharge hose  190  may extend from the vacuum pump  165  for being coupled to the mobile carriage  15  via one or more filters Configured absorb reactive gases. In one embodiment, the unified airflow assembly  145  may include a gas filter  175  interfacing between the discharge hose  190  and the mobile carriage  15  for absorbing the harmful ozone gas in the hot air produced proximate to the UV lamp  35  due to heating-up of the UV lamp  35  during operation. Examples of the gas filter  175  may include, but not limited to, a charcoal filter, an activated-carbon filter, or any other suitable gas filter  175  known in the art, related art, or developed later depending on a desired gas to be filtered or removed. 
     In some embodiments, the vacuum pump  165  may be configured to operate in different modes implemented by the control unit  150 . For example, the vacuum pump  165  may be configured to operate in a power mode and a blower mode. In the power mode, the control unit  150  may be configured to modify aspects of the vacuum pump  165  for manipulating the suction capacity thereof or the pressure per unit time of the fluid such as air driven or passing therethrough. For example, the control unit  150  may increase the voltage or current applied to the vacuum pump  165 , in accordance with the manufacturer&#39;s specification, to increase the speed of rotation of the vacuum pump  165 , thereby increasing the suction capacity, and vice versa. In the blower mode, the control unit  150  may reverse the polarity of the voltage or current applied to the vacuum pump  165 , thereby changing the direction of rotation of the vacuum pump  165  to create a positive air pressure instead of a negative air pressure in the airflow regulator  160 . One having ordinary skill in the art would understand that the blower mode may be implemented provided the vacuum pump  165  is a reversible vacuum pump  165 . Further, in some embodiments, the control unit  150  may be configured to drive the unified airflow assembly  145  to block airflow to the UV hose  185 - 1  in the blower mode. 
     As shown in  FIG.  22   , the body of the Y-shaped airflow regulator  160  may include a first Y-air restriction unit  215 - 1  and a second Y-air restriction unit  215 - 2  (collectively, Y-air restriction units  215 ). The first Y-air restriction unit  215 - 1  may be coupled to the first side arm  195 - 1  and the second Y-air restriction unit  215 - 2  may be coupled to the second side arm  195 - 2  of the Y-shaped airflow regulator  160 . The first Y-air restriction unit  215 - 1  may be configured to control the flow communication between the vacuum pump  165  and the airflow accessory  50 , and the second Y-air restriction unit  215 - 2  may be configured to control the flow communication between the vacuum pump  165  and the UV lamp  35 , or the head assembly  30 . Exemplary designs for the Y-air restriction units  215  may include, but not limited to, valves, plugs, discs, or any other suitable designs known in the art, related art, or developed later. In one embodiment, each of the air restriction units  215  may be implemented as solenoid valves operating to selectively restrict a fluid path. For example ( FIG.  24   ), a first solenoid valve  220 - 1  may be located within the first side arm  195 - 1  to restrict the airflow through the accessory hose  185 - 2  and a second solenoid valve  220 - 2  may be located within the second side arm  195 - 2  to restrict the airflow through the UV hose  185 - 1 . The first solenoid valve  220 - 1  is illustrated in a closed position and the second solenoid valve  220 - 2  is shown in an open position. Each of the first solenoid valve  220 - 1  and the second solenoid valve  220 - 2  (collectively, solenoid valves  220 ) may be configured to open mutually exclusive each other by the control unit  150 . 
     As shown in  FIG.  24   , the central arm  200  may extend to the filtration compartment  170  including a first chamber  225 - 1  and a second chamber  225 - 2  separated by a suitable filter such as those mentioned above. For example, the central arm  200  may be fluidically coupled to the first chamber  225 - 1 . Similarly, the second chamber  225 - 2  may be fluidically coupled to the vacuum pump  165  directly or through a vacuum hose. Further, as shown in  FIG.  24   , the Y-regulator body of the Y-shaped airflow regulator  160  may include a main opening  230  and peripheral openings. The central arm  200  of the Y-shaped airflow regulator  160  may extend into the main opening  230  interfacing with the first chamber  225 - 1  of the filtration compartment  170 . Similarly, the first side arm  195 - 1  may extend into a first peripheral opening  235 - 1  interfacing with the accessory hose  185 - 2  and the second side arm  195 - 2  may extend into a second peripheral opening  235 - 2  interfacing with the UV hose  185 - 1 . The Y-air restriction units such as the solenoid valves  220  may be configured to control the flow communication, via the main opening  230 , of the vacuum pump  165  with (1) the airflow accessory  50  via the first peripheral opening  235 - 1  and ( 2 ) the UV lamp  35  via the second peripheral opening  235 - 2 . The first peripheral opening  235 - 1  and the second peripheral opening  235 - 2  are hereinafter collectively referred to as peripheral openings. 
     Second Configuration of the Airflow Regulator 
     In a second configuration illustrated in  FIGS.  25 - 27   , the airflow regulator  160  may have a Y-shaped body including the side arms  195  and the central arm  200  similar to the first configuration; however ( FIG.  25   ), the airflow regulator  160  may include a single air restriction unit  240 , instead of two Y-air restriction units  215 , movably connected at an intersection point of the first side arm  195 - 1  and the second side arm  195 - 2  within the Y-shaped airflow regulator  160 . The side arms  195  may have a predetermined angle between them. The single air restriction unit  240  (or S-air restriction unit  240 ) may be configured to pivot about a horizontal axis extending across the intersection point. This S-air restriction unit  240  may pivot to substantially restrict the airflow through the first side arm  195 - 1  or the second side arm  195 - 2 . For example, the S-air restriction unit  240  may pivot leftward to block the first side arm  195 - 1  and restrict the airflow therethrough while allowing the airflow through the second side arm  195 - 2 . Alternatively, the S-air restriction unit  240  may pivot rightward to block the second side arm  195 - 2  and restrict the airflow therethrough while allowing the airflow through the first side arm  195 - 1 . While the illustrated embodiments include the S-air restriction unit  240  pivoting to substantially block a predetermined air passage within the Y-shaped airflow regulator  160 , one skilled in the art may contemplate other suitable movements including rotary, pan, swivel, tilt, extend, and slide based on the design of the S-air restriction unit  240 . Exemplary designs of the S-air restriction unit  240  may include such as those mentioned above. Accordingly, such S-air restriction unit  240  may cause the airflow between the central arm  200  and the first side arm  195 - 1  to be mutually exclusive to the airflow between the central arm  200  and the second side arm  195 - 2 . 
     The S-air restriction unit  240  may be controlled automatically or manually using a variety of mechanisms known in the art, related art, or developed later. Exemplary mechanisms may include, but not limited to, electronic/electrical, mechanical, or electromechanical actuation, or any combination thereof. For example, the S-air restriction unit  240  may be controlled by the control unit  150  to automatically pivot to block the first peripheral opening  235 - 1  when a human is present within a predetermined proximity to the UVD device  10 . Further, in addition to the filtration compartment  170 , a first hose filter  245 - 1  may be secured between the first side arm  195 - 1  and the accessory hose  185 - 2  and a second hose filter  245 - 2  may be secured between the second side arm  195 - 2  and the UV hose  185 - 1 . Alternatively, as shown in  FIG.  27   , the first side arm  195 - 1  may directly secure a portion of the accessory hose  185 - 2 , where the first hose filter  245 - 1  may be removably secured to the accessory hose  185 - 2 . Similarly, the second side arm  195 - 2  may directly secure a portion of the UV hose  185 - 1  and the second hose filter  245 - 2  may be removably secured to the UV hose  185 - 1  or the first distal hose  85 - 2  of the airflow accessory  50 , or the second distal hose  130  of the cleaning unit  110 . 
     Third Configuration of the Airflow Regulator 
     In a third configuration ( FIGS.  28 - 29   ), the airflow regulator  160  may have a substantially U-configuration for being fluidically connected to two predetermined sites such as the UV lamp  35  (or the head assembly  30 ) and the airflow accessory  50 . The airflow regulator  160  may have a U-shaped, rigid, body including a vacuum arm  260 , a UV arm  255 , and an accessory arm  250  ( FIG.  30   ), which may be parallel to each other. Further, in one example, the accessory arm  250  and the UV arm  255  may be in the same plane. In another example, at least two of the, vacuum arm  260 , the UV arm  255 , and the accessory arm  250  may be located in the same plane. In yet another example, the vacuum arm  260  may be in a plane different from those of the UV an  255  and the accessory arm  250 . 
     The accessory arm  25 ( 1  may be coupled to the accessory hose  185 - 2  extending  10  have the first open end  205  opening to the rear side of the UVD device  10 . The first open end  205  may be secured to the chassis  180  for easy connection with a compatible accessory such as the airflow accessory  50 . On the other hand, the UV arm  255  may be coupled to the UV hose  185 - 1 , which may extend to the head assembly  30  ( FIG.  29   ) and have the second open end  210  proximate to the UV lamp  35  ( FIG.  28   ), Similar to the first configuration, the airflow regulator  160  may be vertically arranged with other components of the unified airflow assembly  145 , such as the filtration compartment  170  and the vacuum pump  165 , in the U-configuration ( FIG.  31   ); however, other suitable arrangements may be contemplated. One having ordinary skill in the art would understand that the arrangement, position, design, and, functionalities of rest of the components including the vacuum pump  165 , the discharge hose  190 , and the filtration compartment  170  may be same as those described above in the description for  FIGS.  17 - 20   . 
     In one embodiment, as shown in  FIG.  32   , the U-shaped body of the airflow regulator  160  may include a single air restriction unit coupled to both the UV arm  255  and the accessory arm  250 . The air restriction unit may be configured to selectively open a fluid path from the vacuum pump  165  either to the accessory arm  250  or the UP arm  255 , thereby controlling the flow communication between the vacuum pump  165  and either the airflow accessory  50  or the UV lamp  35  respectively. In one embodiment, the air restriction unit may he a linear actuator valve  265  configured to transition back and forth to selectively restrict a fluid path. The actuator valve  265  may include gap  295  configured to align with a desired fluid path of either the accessory arm  250  or the UV arm  255  upon being triggered by the control unit  150 . Such alignment may open the desired fluid path, e.g., of the accessory arm  250  or the UV arm  255 , to allow a fluid flow therethrough at a given instance. 
     Similar to the first configuration, the body of the airflow regulator  160  may include the main opening  230  and the peripheral openings. The vacuum arm  260  of the airflow regulator  160  may extend into the main opening  230  interfacing with the first chamber  2254  of filtration compartment  170 . Similarly, the accessory arm  250  may extend into the first peripheral opening  235 - 1  interfacing with the accessory hose  185 - 2 , and the UV arm  255  may extend into the second peripheral opening  235 - 2  interfacing with the UV hose  185 - 1 . The linear actuator valve  265  may be configured to control the flow communication, vita the main opening  230 , of the vacuum pump  165  with (1) the airflow accessory  50  via the first, peripheral opening  235 - 1  and (2) the UV lamp  35  via the second peripheral opening  235 - 2 . The first peripheral opening  235 - 1  and the second peripheral opening  235 - 2  are hereinafter collectively referred to as peripheral openings  235 . 
     Fourth Configuration of the Airflow Regulator 
     In a fourth configuration, as depicted in  FIGS.  33 - 34   , the airflow regulator  160  may have a T-shaped, body including a left arm  270 , a middle arm  280 , and a right arm  275 . In one example, the middle arm  280  may be perpendicular to both the left arm  270  and the right arm  275 . In another example, the left arm  270  and the right arm  275  may be in the same plane and opposite to each other. In yet another example, each of the left arm  270 , the middle arm  280 , and the right arm  275  may be in the same plane. In still another example, the middle arm  280  may be in a plane different from that of the left arm  270  and the right arm  275 . 
     The middle arm  280  may extend into the main opening  230 , the left arm  270  may extend into the first peripheral opening  235 - 1 , and the right arm  275  may extend into the second peripheral opening  235 - 2 . Each of the main opening  230 , the first peripheral opening  235 - 1 , and the second peripheral opening  235 - 2  may have a substantially circular cross-section: other suitable cross-sectional shapes, e.g., elliptical, oval, polygon, irregular, etc., may be employed based on a cross-section of components being received. Further, as shown in  FIG.  33   , the middle arm  280  may removably secure the filtration compartment  170 , which in turn may be connected or coupled to a portion of the vacuum hose. The left arm  270  may removably secure a filter  285 - 1 , which may be connected or coupled to the accessory hose  185 - 2 . Similarly, the right arm  275  may removably secure a filter  285 - 2 , which may be connected or coupled to a portion of the UV hose  185 - 1  extending to the head assembly  30  and proximate to the UV lamp  35 . Alternatively. as depicted in  FIG.  34   , the middle arm  280  may directly secure a portion of the vacuum hose, where a filter  285 - 3  may be removably secured within the vacuum hose instead of being positioned with the middle arm  280 . Further, the left arm  270  may directly secure a portion of the accessory hose  185 - 2 , where the filter  285 - 1  may be removably secured to the accessory hose  185 - 2 . Similarly, the right arm  275  may directly secure a portion of the UV hose  185 - 1 , where the filter  285 - 2  may be removably secured within the UV hose  185 - 1 . 
     In such configuration, the T-shaped airflow regulator  160  may include a first air restriction unit  290 - 1  located adjacent to the left arm  270  and a second air restriction unit  290 - 2  located adjacent to the right arm  275 , such that the middle arm  280  may be located between the first air restriction unit  290 - 1  and the second air restriction unit  290 - 2 . The first air restriction unit  290 - 1  may be configured to selectively restrict the airflow through the left .arras  270  and the second air restriction unit  290 - 2  may be configured to selectively restrict the airflow through the right arm  275 . 
     Each of the first air restriction unit  290 - 1  and the second air restriction unit  290 - 2  (collectively, referred to as air restriction units  290 ) may be configured to transition between a closed configuration to an open configuration. In the closed configuration, the air restriction units  290  may move, e.g., substantially perpendicular to a horizontal axis passing through the center of the left arm  270  or the right arm  275 , to lock or seal either the left arm  270  and the right arm  275  respectively for restricting the airflow through the locked arm. In the open configuration, the air restriction units  290  and may move away, e.g., substantially parallel to the horizontal axis passing through the center of the left arm  270  or the right arm  275 , to open either the left arm  270  and the right arm  275  respectively, thereby allowing the air to pass through the opened arm. One having ordinary skill in the art may implement other possible movements including rotary, pan, swivel, tilt, extend, and slide to maneuver the air restriction units based on the design or structure of the air restriction units. 
     Accordingly, air restriction units  290  may cause the airflow between the middle arm  280  and the left arm  270  to be mutually exclusive, to the airflow between the middle arm  280  and the right arm  275 . In some embodiments, the air restriction units  290  may open the air passage in response to a predetermined temperature being above a predefined threshold value in the T-shaped airflow regulator  160 . 
     The air restriction units  290  may be controlled automatically by the control unit  450  or manually using a variety of mechanisms known in the art, related art, or developed later. Examples of such mechanisms may include, but not limited to, electronic/electrical, mechanical, or electromechanical actuation, or any combination thereof. For example, the first air restriction unit  290 - 1  may automatically pivot to block the first peripheral opening  235 - 1  when a human is present proximate to the UVD device  10 . 
       FIGS.  35 - 42    illustrate exemplary methods of using the unified, airflow system  40  implemented on the UVD device  10  of  FIG.  1   , according to an embodiment of the present disclosure. The order in which the methods are described is not intended to be construed as a limitation, and any number of the described method steps can be combined or otherwise performed in ally order to implement the methods, or an alternate method. Additionally, individual aspects may be deleted from the method without departing from the spirit and scope of the subject matter described herein. Furthermore, aspects of the methods can be implemented in any suitable hardware, software, firmware, or combination thereof, that exists in the related art or that is later developed. 
     The methods describe, without limitation, implementation of the UVD device  10  for disinfection and cleaning services scenario. One of skill in the art will understand that the method may be modified appropriately for implementation in a variety of scenarios without departing from the scope and spirit of the disclosure. 
     The methods are described with respect to different configurations of the airflow regulator  160  of the unified airflow assembly  145 .  FIGS.  35 - 36    illustrate a method with respect to the first configuration of the airflow regulator  160 ;  FIGS.  37 - 38    illustrates a method with respect to the second configuration:  FIGS.  39 - 40    illustrates a method with respect to the third configuration; and  FIGS.  41 - 42    illustrates a method with respect to the fourth configuration of the airflow regulator  160  discussed above. 
     The UVD device  10  may be implemented with the unified airflow system  40  and coupled to the airflow accessory  50  configured for decontamination of a target surface. The UVD device  10  may be configured to operate in predetermined modes via the control unit  150  In one embodiment, the UVD device  10  may be configured to operate in a disinfection mode and a cleaning mode, each of which may be implemented in any order; however, an operator may select and perform operations pertaining to the cleaning mode prior to those of the disinfection mode for faster and wholistic decontamination. During operation, an operator may select one of the modes using any of the input devices known in the art, related art, or developed later. For example, the operator may login on an interactive display screen of the display unit  45  in communication with the control unit  150  and select one of those modes on the screen. The control unit  150  may be configured to control the operation of the  12  VD device  10  as well as that of the unified airflow system  40 . In some embodiments, the control unit  150  may facilitate the unified airflow system  40  being controlled independent of the UVD device  10 . In some other embodiments, each of the unified airflow system  40  and the UVD device  10  may have dedicated control boxes working in synchronization with each other for the intended operation. 
     Cleaning Mode 
     When the cleaning mode is selected, the control Unit  150  may deactivate the head assembly  30  including the operation of the UV lamp  35 , and allow for activation of the airflow accessory  50 , or the cleaning unit  110 , coupled to the unified airflow assembly  145  via the first open end  205  of the accessory hose  185 - 2  secured to the chassis  180 . At this point, the control unit  150  may be configured to drive the head assembly  30  in the retracted position or shut down the UV lamp  35  or orient the UV lamp  35  to project towards the UVD device  10 , However, in some examples, the control unit  150  may operate to shut down the UV lamp  35  while keeping the head assembly  30  in the open position. 
     In the first configuration of the, airflow regulator  160  ( FIG.  36   ), the control unit  150  may drive the second restriction unit  215 - 2  in the second side arm  195 - 2  to selectively restrict an airflow between the vacuum pump  165  and the UV lamp  35  or a site proximate thereto. For example, the control unit  150  may rotate the second solenoid valve  220 - 2  in the second side arm  195 - 2  to close the airflow passage therethrough, thereby blocking the airflow passage leading to the UV lamp  35  via the UV hose  185 - 1  coupled to the second side arm  195 - 2 . However, the first restriction unit  215 - 1  such as the first solenoid valve  220 - 1  in the first side arm  195 - 1  may be maintained in an open position by the control unit  150 . As a result, a flow communication may be established between the vacuum pump  165 , via the central arm  200 , and the airflow accessory  50 , or the cleaning unit  110 , via the UV hose  185 - 1  coupled to the first side arm  195 - 1 . 
     Similarly, in the second configuration of the airflow regulator  160  ( FIG.  38   ), the control unit  150  may drive the air restriction unit  240  to pivot towards the second side arm  195 - 2  of the Y-shaped airflow regulator  160  while keeping an airflow passage open in the first side arm  195 - 1 . As a result, the airflow passage leading to the UV lamp  35  via the UV hose  185 - 1  coupled to the first side arm  195 - 1  may be blocked. However, the airflow passage towards the airflow accessory  50 , or the cleaning unit  110 , via the accessory hose  185 - 2  coupled to the first side arm  195 - 1  may remain open, thereby establishing a flow communication between the vacuum pump  165 , via the central arm  200 , and the airflow accessory  50 , or the cleaning unit  110 , via the first side arm  195 - 1  and the accessory hose  185 - 2  connected thereto. 
     Further, in the third configuration of the airflow regulator  160  ( FIG.  40   ), the control unit  150  may drive the air restriction unit such as the linear actuator valve  265 , e.g., to the left as shown, for closing the UV arm  255  while aligning the gap  295  in the actuator valve  265  with airflow passage in the accessory arm  250 . As a result, the airflow passage in the UV arm  255  may be blocked and that in the accessory arm  250  may be open, thereby establishing a flow communication between the vacuum pump  165 , via the central arm  200 , and the airflow accessory  50 , or the cleaning unit  110 , via the accessory arm  250  and the accessory hose  185 - 2  connected thereto. 
     In the fourth configuration of the airflow regulator  160  ( FIG.  42   ), the control unit . 150  may drive&gt;the second air restriction unit  290 - 2  to extend toward the right arm  275  of the airflow regulator  160 . For example, the second air restriction unit  290 - 2  may be driven to be substantially perpendicular to a horizontal axis passing through the center of the right arm  275 , thereby blocking the airflow passage leading to the UV lamp  35  via the UV hose  185 - 1 . As a result, the second air restriction unit  290 - 2  substantially restricts a flow communication between the vacuum pump  165  and the UV lamp  35  from within the airflow regulator  160 . On the other hand, the control unit  150  may pivot the first air restriction unit  290 - 1  away from the left arm  270  to unblock an air passage that extends to the airflow accessory  50 , or the cleaning unit  110 . via the left arm  270  of the airflow regulator  160 . This unblocked air passage may extend to the airflow accessory  50 , or the cleaning unit  110 , through the accessory hose  185 - 2 , which, at one end, may be coupled to the airflow accessory  50  directly, or via a distal hose coupled thereto. At the other end, the accessory hose  185 - 2  may be coupled to the left arm  270 . As a result, a flow communication may be established between the accessory hose  185 - 2 , or the cleaning unit  110 , and the vacuum pump  165  via the left arm  270 . 
     Subsequently, when the vacuum pump  165  may be activated by the control unit  150 , it may create a suction airstream, or a negative air pressure, in the accessory hose  185 - 2 , and by extension in the first set of hoses of the airflow accessory  50  or the second set of hoses of the cleaning unit  110  via the airflow regulator  160 . The suction airstream may draw air from the set of proximal hoses, which may accordingly extract contaminants, e.g., from a surface or atmosphere due to the negative air pressure created by the suction airstream. Although the extracted contaminants may be collected in the dirt collection unit  115 , the drawn, air may become unclean due such contaminants. This unclean air may be filtered by the filtration unit  120  in the airflow accessory  50 , or the cleaning unit  110 , as well as the filtration compartment  170  coupled between the airflow regulator  160  and the vacuum pump  165 . The filtered air may be expelled from the UVD device  10  through the discharge hose  190  of the vacuum pump  165  via the airflow regulator  160 , while the blocked air passage between the vacuum pump  165  and the UV hose  185 - 1  prevents the unclean air from moving across to the UV lamp  35 . Further, the drawn unclean air may be filtered by any additional filters located along the airflow path between the airflow accessory  50 , or the cleaning unit  110 , and the vacuum pump  165 . Accordingly, the proximal hoses may be moved around for removing contaminants from intended surfaces in a designated area using the suction airstream provided by the unified airflow system  40 . 
     Disinfection Mode 
     After the cleaning operation or when surface disinfection is desired, the operator may deactivate the cleaning mode and remotely select the disinfection mode on the UVD device  10 . The operator may devoid, human occupancy in the designated area where the disinfection is to be performed prior to activating the disinfection mode to avoid health hazards due to the UV 
     When the disinfection mode is activated, the control unit  150  may deactivate the airflow accessory  50  and allow for activation of the head assembly  30  and that of the UV lamp  35 . At this point, the control unit  150  may be configured to drive the head assembly  30  to the open position from the retracted position. In the open position, the control unit  150  may drive the head assembly  30  out of the recess  60  in the cabinet  20  to a predetermined angle with respect to a horizontal axis substantially parallel to the floor. 
     In the first configuration of the airflow regulator  160  ( FIG.  35   ), the control unit  150  may drive the first restriction unit  215 - 1  in the first side arm  195 - 1  to selectively restrict an airflow between the vacuum pump  165  and the airflow accessory  50 , or the cleaning unit  110 . For example, the control unit  150  may rotate the first solenoid valve  220 - 1  in the first side arm  195 - 1  to close the airflow passage therethrough, thereby blocking the airflow passage leading to the airflow accessory  50 , or the cleaning unit  110 , via the accessory hose  185 - 2 . However, the second restriction unit  215 - 2  such as the second solenoid valve  220 - 2  in the second side arm  195 - 2  may be maintained in an open, position by the control, unit  150 . As a result, a flow communication may be established between the vacuum pump  165 , via the central arm  200 , and the UV lamp  35  via the UV hose  185 - 1  coupled to the second side arm  195 - 2 . 
     Similarly, in the second configuration of the airflow regulator  160  ( FIG.  37   ), the control unit  150  may drive the air restriction unit  240  to pivot towards the first side arm  195 - 1  of the Y-shaped airflow regulator  160  while keeping an airflow passage open in the second side arm  195 - 2 . As a result, the airflow passage leading to the airflow accessory  50 , or the cleaning unit.  110 , via the accessory hose  185 - 2  coupled to the first side arm  195 - 1  may be blocked. However, the airflow passage towards the UV lamp  35  via the UV hose  185 - 1  coupled to the second side arm  195 - 2  may remain open, thereby establishing a flow communication between the vacuum pump  165 , via the central arm  200 , and the UV lamp  35  via the second side arm  195 - 2  and the UV hose  185 - 1  connected thereto. 
     Further, in the third configuration of the airflow regulator  160  ( FIG.  39   ), the control unit  150  may drive the air restriction unit such as the linear actuator valve  265 , e.g., to the right as shown, for closing the accessory arm  250  while aligning the gap  295  in the actuator valve  265  with airflow passage in the UV arm  255 . As a result, the airflow passage in the accessory arm  250  may be blocked and that in the UV arm  255  may be open, thereby establishing a flow communication between the vacuum pump  165 , via the central arm  200 , and the UV lamp  35  via the UV arm  255  and the UV hose  185 - 1  connected thereto. 
     In the fourth configuration of the airflow regulator  160  ( FIG.  41   ), the control unit  150  may drive the first air restriction unit  290 - 1  to extend toward the left arm  270  of the airflow regulator  160 . For example, the first air restriction unit  290 - 1  may be driven to be substantially perpendicular to a horizontal axis passing through the center of the left arm  270 , thereby blocking the airflow passage leading to the airflow accessory  50  via the accessory hose  185 - 2 . As a result, the first air restriction unit  290 - 1  substantially restricts a flow communication between the vacuum pump  165  and the airflow accessory  50 , or the cleaning unit  110 , from within the airflow regulator  160 . On the other hand, the control unit  150  may pivot the second air restriction unit  290 - 2  away from the right arm  275  to unblock an air passage that extends to the UV lamp  35  via the right arm  275  of the airflow regulator  160 . This unblocked air passage may extend to the UV lamp  35  through the UV hose  185 - 1 , which, at one end, may be proximate to the UV lamp  35  in the head assembly  30  and at the other end, may be coupled to the right arm  275 . As a result, a flow communication may be established between the UV lamp  35  and the vacuum pump  165  via the right arm  275 . 
     Subsequently, upon being switched on by the control unit  150 , e.g., based on an input received from an operator, the vacuum pump  165  may create a suction airstream, or a negative air pressure, in the UV hose  185 - 1 . The suction airstream may draw the hot air proximate to the UV lamp  35  via the UV hose  185 - 1 , thereby cooling the UV lamp  35 . The drawn hot air may be expelled through the discharge hose  190  of the vacuum pump  165  via the airflow regulator  160  while the respective air restriction units  215 - 1 ,  220 - 1 .  240 ,  265 .  290 - 1  blocking the air passage to the airflow accessory  50  may prevent the unclean air or any residue in the accessory hose  185 - 2  coupled to the airflow accessory  50 , or the cleaning unit  110 , from moving across to the UV lamp  35 . Further, the hot air drawn from the UV lamp  35  may contain ozone, which may be filtered by one or more filters such as the gas filter  175  coupled to the discharge hose  190  along the airflow passage between the UV lamp  35  and the vacuum pump  165 , thereby preventing any health hazards. 
     While being cooled by the suction airstream, the control unit  150  may orient the head assembly  30  at predetermined angles for the UV lamp  35  to project the UV light on intended surfaces such floor, walls, ceilings, and objects in a designated area. The UV light may disinfect the surfaces, which were previously decontaminated during the cleaning mode, for a wholistic and faster decontamination. The disinfection mode may be activated for a predefined or dynamically defined duration and may be interrupted either on-demand by the operator or based on preset or dynamically set conditions such as those indicated by various sensors (e.g., motion/vibration sensors, occupancy/proximity sensors, ozone sensors, temperature sensors, smoke sensors, pathogen level detection sensors, etc.) in communication with the UVD device  10 . Examples of these conditions may include, but not limited to, motion detection in the proximity of the UVD device  10  or remote sensors communicating therewith, temperature of the UV lamp above a predefined threshold, accumulation of ozone above a predefined threshold, and so on. 
     The above description does not provide specific details of manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those in the art are capable of choosing suitable manufacturing and design details. Notably, the figures and examples described herein are not meant to limit the scope of the present disclosure to a single embodiment, but other embodiments are possible by way of interchange of some or all of the described or illustrated elements. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.