Patent Description:
These outlets can be designed to generate circular airflow patterns within the cabin. Air can be exhausted through air returns located in sidewalls near the floor of the cabin. These grills can be located along the length of the cabin and on both sides of the cabin. Air can be supplied and exhausted from the passenger area on a continuous basis. Current personal air distribution nozzles include gaspers located above passenger seats. However, gaspers may provide an uncomfortably high velocity of air flow that can create a draft.

Therefore, it would be desirable to have a method and apparatus that takes into account at least some of the issues discussed above, as well as other possible issues. For example, it may be desirable to provide an alternative personal air distribution system.

<CIT>, in accordance with its abstract, states a vehicular air conditioner includes a first outlet that blows a conditioned air frontward to flow past a neck part of an occupant on a seat, and a second outlet that is provided below the first outlet and blows the conditioned air upward to flow past an armpit part of the occupant. The second outlet blows the conditioned air to merge with the conditioned air blown from the first outlet. The second outlet blows the conditioned air with an airflow volume larger than an airflow volume of the conditioned air from the first outlet such that the conditioned air blown from the second outlet guides the conditioned air blown from the first outlet to flow along a face of the occupant. Moreover, a housing is fixed to a lower portion of a seat portion. The housing and a refrigeration cycle device accommodated in the housing are slidably moveable integrally with the seat.

<CIT>, in accordance with its abstract, states a method for providing purified air to an occupant of a seat in a mask lacking corporeal features that is generated by an apparatus. The apparatus includes a contaminant conditioning system that delivers purified air to a first and a second laminar flow generator. Each laminar flow generator produces a respective laminar flow that combines to form and fill a breathing space with purified air that envelopes an inhalation sphere of the occupant and inhibits air other than the purified air from entering the breathing space. Moreover, an inlet, an ultraviolet light unit, a fan, a filter and a duct system may be integrated within the seatback of the seat, and outlets may be located in a headrest.

<CIT>, in accordance with its abstract, states a device for ventilating the occupant of a vehicle seat, comprising an air inlet receiving air from a ventilation member, and comprising a first duct integrated at least in part into the backrest of the seat, a second duct integrated into a headrest mounted on the seat and supplying at least one air outlet integrated into the headrest and expelling air coming from the ventilation member, the second duct and first duct being connected by a leak tight sliding connection.

An example of the present disclosure provides a ventilation assembly. The ventilation assembly comprises a number of fan systems configured to purify air and a number of air distribution assemblies. Each air distribution assembly of the number of air distribution assemblies is configured to be removably installed on a seatback of a passenger seat. Each air distribution assembly of the number of air distribution assemblies comprises a pair of air distribution vents, ductwork configured to receive air from at least one fan system of the number of fan systems and direct air to the pair of air distribution vents, and a seat attachment device configured to removably couple the pair of air distribution vents to the seatback such that each air distribution vent is situated on opposite sides of the seatback for providing purified air to a seated passenger and a number of mounting plates, wherein each mounting plate of the number of mounting plates is configured to attach to a seat track of an aircraft, and wherein each mounting plate of the number of mounting plates comprises a base configured to join to a fan system of the number of fan systems.

Another example of the present disclosure provides a ventilation assembly. The ventilation assembly comprises a number of fan systems configured to draw in and purify air, a manifold configured to distribute air from the number of fan systems to a number of air distribution assemblies, a number of mounting plates, and the number of air distribution assemblies. Each mounting plate of the number of mounting plates is configured to attach to a seat track of an aircraft. Each mounting plate of the number of mounting plates comprises a base configured to connect to a fan system of a number of fan systems, and a positioning feature configured to restrain the manifold. Each air distribution assembly of the number of air distribution assemblies is configured to be removably installed on a seatback of a passenger seat. Each air distribution assembly of the number of air distribution assemblies comprises a pair of air distribution vents, ductwork configured to direct air from the manifold to the air distribution vents, and a seat attachment device configured to removably couple the pair of air distribution vents to the seatback such that each air distribution vent is situated on opposite sides of the seatback for providing purified air to a seated passenger.

A further example of the present disclosure not within the scope of the claims provides a ventilation assembly. The ventilation assembly comprises a number of fan systems configured to draw in and purify air, a manifold configured to distribute air from the number of fan systems to a number of air distribution assemblies, a number of mounting plates, each mounting plate of the number of mounting plates configured to attach at least one of the manifold or a fan system of the number of fan systems to a seat track of an aircraft, and the number of air distribution assemblies, each air distribution assembly of the number of air distribution assemblies configured to be removably installed on a seatback of a passenger seat. Optionally, the manifold comprises a number of flow restrictors configured to substantially equalize pressure and flow rate of the air supplied by the manifold to each air distribution assembly. Optionally, each air distribution assembly of the number of air distribution assemblies is below a threshold weight for recertification of the passenger seat.

A yet further example of the present disclosure provides an aircraft. The aircraft comprises a plurality of sets of passenger seats and a plurality of ventilation assemblies. Each ventilation assembly of the plurality of ventilation assemblies is associated with a respective set of passenger seats in the plurality of sets of passenger seats. Each ventilation assembly of the plurality of ventilation assemblies comprises a number of mounting plates, a number of fan systems, and a number of air distribution assemblies. Each mounting plate of the number of mounting plates attached to a respective seat track. The number of fan systems is configured to purify air. Each fan system is positioned beneath the respective set of passenger seats and connected to a base of a respective mounting plate of the number of mounting plates. Each air distribution assembly of the number of air distribution assemblies is configured to be removably installed on a seatback of a passenger seat in the set of passenger seats. Each air distribution assembly of the number of air distribution assemblies comprises a pair of air distribution vents, ductwork configured to receive air from at least one fan system of the number of fan systems and direct air to the pair of air distribution vents, and a seat attachment device configured to removably couple the pair of air distribution vents to the seatback such that each air distribution vent is situated on opposite sides of the seatback for providing purified air to a seated passenger. Optionally, each ventilation assembly of the plurality of ventilation assemblies has a greater quantity of air distribution assemblies than fan systems.

A yet further example of the present disclosure not within the scope of the claims provides a ventilation assembly. The ventilation assembly comprises a number of fan systems mounted to a number of seat tracks in an aircraft and configured to purify air from the aircraft, and a number of air distribution assemblies pneumatically connected to the number of fan systems. Each air distribution assembly of the number of air distribution assemblies is removably installed on a seatback of a passenger seat and configured to provide air to the passenger seat and create a personal breathing space.

A still further example of the present disclosure provides a method of installing a ventilation assembly. A number of fan systems is secured to a number of seat tracks and beneath a set of passenger seats in an aircraft. A number of air distribution assemblies is removably connected to seatbacks of passenger seats in the set of passenger seats. Ductwork of the number of air distribution assemblies is connected to the number of fan systems.

The features and functions can be achieved independently in various examples of the present disclosure or may be combined in yet other examples in which further details can be seen with reference to the following description and drawings.

The novel features believed characteristic of the examples are set forth in the appended claims. The examples, however, as well as a preferred mode of use, further objectives and features thereof, will best be understood by reference to the following detailed description of an example of the present disclosure when read in conjunction with the accompanying drawings, wherein:.

The examples recognize and take into account one or more different considerations. The examples recognize and take into account that current aircraft environmental control systems attempt to minimize passengers from inhaling contaminants by reducing the total number of contaminants in an aircraft cabin. A purity level of the cabin air is commonly defined as a percentage of contaminant free air in a volume of sampled air.

Cabin air purity levels generally increase when the air inside the cabin is replaced by air from outside the cabin. Obtaining more outside air to inject into the cabin has the drawback of increasing aircraft fuel consumption. To reduce aircraft fuel consumption, the aircraft industry has increasingly reduced outside airflow into the cabin. To compensate for the reduced airflow into the cabin, yet maintain allowable cabin air purity levels, the aircraft industry standard has been to add large cabin air recirculation systems that incorporate large high efficiency particulate air filters. Cabin air recirculation systems often include large and powerful fans to draw cabin air through the filters and inject the air back into the cabin. Cabin air recirculation systems can include an air distribution assembly. Current cabin air distribution assemblies tend to inject high velocity non-laminar streams of air into the aircraft cabin.

The examples recognize and take into account that a solution should not undesirably cause concerns for emergency egress, create head strike issues, or provide break away issues when the aircraft is in use. The examples recognize and take into account that integrated personal air delivery could be provided in a new aircraft design, but would require multiple years of design, testing, and production. The examples recognize and take into account that the examples provide a retrofit to current passenger seating. The examples recognize and take into account that the examples can provide the benefits equivalent to integrated air delivery designs without recertification of the passenger seats or aircraft. The examples recognize and take into account that the examples can provide the benefits equivalent to integrated air delivery designs without the time for design, testing, and production.

Turning now to <FIG> is an illustration of an aircraft cabin in which an example may be implemented. Aircraft <NUM> comprises plurality of rows of passenger seats <NUM> and plurality of ventilation assemblies <NUM> in passenger cabin <NUM>. Each ventilation assembly of plurality of ventilation assemblies <NUM> is associated with a respective set of passenger seats in plurality of rows of passenger seats <NUM>. Each set of passenger seats includes any desirable quantity of passenger seats. As depicted, each set of passenger seats comprises three passenger seats in a row of passenger seats on a single side of an aisle in passenger cabin <NUM>. However, in other examples, a set of passenger seats includes any desirable quantity of passenger seats.

As depicted, plurality of sets of passenger seats <NUM> includes set of passenger seats <NUM>, set of passenger seats <NUM>, set of passenger seats <NUM>, set of passenger seats <NUM>, set of passenger seats <NUM>, and set of passenger seats <NUM>. As depicted, each set of passenger seats in plurality of passenger seats <NUM> is a row of passenger seats that has a respective ventilation assembly associated with the set of passenger seats. In some non-depicted examples, each passenger seat has its own respective ventilation assembly associated with the passenger seat.

Although, as depicted, each set of passenger seats is a row of passenger seats a set of passenger seats can include any quantity of passenger seats. In some examples, a set of passenger seats is a subset of a row of passenger seats.

A ventilation assembly of the examples can be installed in aircraft <NUM> without recertifying plurality of passenger seats <NUM>. A ventilation assembly of the examples can be installed in aircraft <NUM> as a retrofit, after aircraft has been placed into service with an airline.

Turning now to <FIG>, a block diagram of a ventilation assembly is depicted in accordance with an example. Ventilation assembly <NUM> can be used in aircraft <NUM> of <FIG>. Ventilation assembly <NUM> comprises number of fan systems <NUM> configured to purify air and number of air distribution assemblies <NUM>. Each of number of fan systems <NUM> includes a respective disinfection system <NUM>. Disinfection system <NUM> includes at least one of UV sanitizing equipment, an electric filter, or a mechanical air filter.

As used herein, "a number of," when used with reference to items means one or more items. For example, number of fan systems <NUM> includes one or more fans. In some examples, number of fan systems <NUM> includes only one fan system. In some examples, the quantity of fan systems in number of fan systems <NUM> is less than a quantity of air distribution assemblies in number of air distribution assemblies <NUM>. In some examples, the quantity of fan systems in number of fan systems <NUM> is the same as the quantity of air distribution assemblies in number of air distribution assemblies <NUM>.

As used herein, the phrase "at least one of," when used with a list of items, means different combinations of one or more of the listed items may be used and only one of each item in the list may be needed. For example, "at least one of item A, item B, or item C" may include, without limitation, item A, item A and item B, or item B. Of course, any combinations of these items may be present. In other examples, "at least one of" may be, for example, without limitation, two of item A; one of item B; and ten of item C; four of item B and seven of item C; or other suitable combinations. The item may be a particular object, thing, or a category. In other words, at least one of means any combination items and number of items may be used from the list but not all of the items in the list are required.

Each air distribution assembly of number of air distribution assemblies <NUM> is configured to be removably installed on a seatback of a passenger seat. Each air distribution assembly of number of air distribution assemblies <NUM> is configured to provide purified air from number of fan systems <NUM> to a seated passenger.

In some examples, each air distribution assembly of number of air distribution assemblies <NUM> comprises a pair of air distribution vents, ductwork configured to receive air from at least one fan system of number of fan systems <NUM> and direct air to the pair of air distribution vents, and a seat attachment device configured to removably couple the pair of air distribution vents to the seatback such that each air distribution vent is situated on opposite sides of the seatback for providing purified air to a seated passenger. In some examples, removably connecting number of air distribution assemblies <NUM> to the seatbacks of the passenger seats in a set of passenger seats comprises at least one of extending or contracting an attachment system to encircle a portion of a respective seatback.

Ventilation assembly <NUM> is associated with a set of passenger seats. As used herein, a "set of," when used with reference to items means one or more items. For example, a set of passenger seats includes one or more passenger seats. In some examples, a set of passenger seats includes the passenger seats in a same row and on a same side of an aisle. In some examples, in first class, a set of passenger seats can be a single seat. In some examples, in business class, a set of passenger seats may include two seats. In some examples, in economy, a set of passenger seats may include up to three seats.

To reduce the weight attached to a passenger seat, number of fan systems <NUM> is not attached to a passenger seat. Number of fan systems <NUM> is connected to a number of seat tracks in the aircraft by number of mounting plates <NUM>. Each mounting plate of number of mounting plates <NUM> is configured to attach to a seat track of an aircraft. Each mounting plate of number of mounting plates <NUM> comprises a base configured to connect to a fan system of number of fan systems <NUM>.

In some examples, number of fan systems <NUM> provides air to number of air distribution assemblies <NUM> directly. In some other examples, manifold <NUM> is present. Manifold <NUM> is configured to distribute air from number of fan systems <NUM> to number of air distribution assemblies <NUM>. In these examples, each mounting plate of number of mounting plates <NUM> comprises a positioning feature configured to restrain manifold <NUM>.

The illustration of ventilation assembly <NUM> in <FIG> is not meant to imply physical or architectural limitations to the manner in which an example may be implemented. Other components in addition to or in place of the ones illustrated may be used. Some components may be unnecessary. Also, the blocks are presented to illustrate some functional components. One or more of these blocks may be combined, divided, or combined and divided into different blocks when implemented in an example. In some examples, manifold <NUM> is not present.

Turning now to <FIG>, a block diagram of an aircraft is depicted in accordance with an example. In some examples, aircraft <NUM> is a physical implementation of aircraft <NUM>. Ventilation assembly <NUM> can be implemented in aircraft <NUM>.

Aircraft <NUM> has passenger cabin <NUM> with plurality of sets of passenger seats <NUM>. Aircraft <NUM> comprises plurality of sets of passenger seats <NUM> and a plurality of ventilation assemblies <NUM>. Each ventilation assembly of plurality of ventilation assemblies <NUM> is associated with a respective set of passenger seats in plurality of sets of passenger seats <NUM>. Each ventilation assembly of plurality of ventilation assemblies <NUM> comprises a number of mounting plates, a number of fan systems, and a number of air distribution assemblies.

As depicted, ventilation assembly <NUM> is associated with set of passenger seats <NUM>. Set of passenger seats <NUM> is one set in plurality of sets of passenger seats <NUM>. Ventilation assembly <NUM> comprises number of mounting plates <NUM>, number of fan systems <NUM>, and number of air distribution assemblies <NUM>. Number of fan systems <NUM> is an example of number of fan systems <NUM> of <FIG>. Number of fan systems <NUM> is configured to draw in and purify air. Number of fan systems <NUM> provides the purified air to number of air distribution assemblies <NUM>. Number of air distribution assemblies <NUM> is configured to direct the purified air to passengers within set of passenger seats <NUM>.

As used herein, purified air is air that has a reduced amount of contaminants than air entering number of fan systems <NUM>. Contaminants may include without limitation bacteria or virus elements, as well as dust, mold, and/or other allergens or irritants.

Each fan of number of fan systems <NUM> comprises at least one of UV sanitizing equipment, an electric filter, or a mechanical air filter. As depicted, fan system <NUM> is one of number of fan systems <NUM>. Fan system <NUM> includes at least one of electric filter <NUM>, mechanical filter <NUM>, or UV sanitizing equipment <NUM>. In some examples, mechanical filter <NUM> is a high efficiency particulate air filter (HEPA filter).

Each of number of air distribution assemblies <NUM> can provide laminar flow to create a barrier that minimizes mixing with the ambient environment. For number of air distribution assemblies <NUM> to deliver purified air, the air supplied to number of air distribution assemblies must be purified. Purified air may be delivered from a purified air source. In this example, the purified air source is number of fan systems <NUM>.

Mechanical filter <NUM>, such as High efficiency particulate air (HEPA) filters, can be used to purify air flow. High efficiency particulate air (HEPA) filters use pressurized air to flow through the filter. Filter size and material composition of a filter may dictate a pressure required for adequate flow through the filter.

A pressurization source, such as without limitation, a fan, is required to generate the pressurization. In passenger cabin <NUM>, vibration and noise levels created by a motor running the fan, a movement of the fan, and/or by the flow of the air itself, are factors in the design of number of fan systems. It is desirable to maintain vibration and noise levels to within comfortable levels for each individual passenger at each individual seat. It is also desirable to maintain noise levels of all of the fan systems in plurality of ventilation assemblies <NUM> to within comfortable levels in passenger cabin <NUM> as a whole. Without limitation, U. Occupational Safety and Health Administration Noise standards (<NUM> CFR <NUM>) require employers to have a hearing conservation program in place if workers are exposed to a time-weighted average (TWA) noise level of <NUM> decibels (dBA) or higher over an <NUM>-hour work shift. Thus, supplying the purified air may utilize number of fan systems <NUM> that does not require filters of a size or density that require fans of a size and/or power, or airflow at a rate, that creates excessive noise. In some examples, it may be desirable to keep noise levels at near a passenger seat headrest below <NUM> decibels.

Further, if fans in number of fan systems <NUM> are too powerful, they may produce an uncomfortably high velocity of air flow near a passenger. Uncomfortably high velocity of air flow can create a draft. Number of fan systems <NUM> and manifold <NUM>, when present, can be designed to provide a desired pressure and flow rate of purified air. In some examples, flow to an air distribution assembly of number of air distribution assemblies is at no more than ten cubic feet per minute (<NUM> litres per second) or no more than approximately ten cubic feet per minute (<NUM> litres per second).

Additional considerations for number of fan systems <NUM> includes the power draw and source for a motor driving the fan. Power availability to run number of fan systems <NUM> is a consideration in choosing the size and type of purification system within a fan system, such as fan system <NUM>. An aircraft environment may not allow for motor weights or power requirements that may be functional in locations such as inside an automobile or in a home or office space.

Ultraviolet purification does not produce a pressure drop, which can allow for smaller and quieter motors that utilize less power than mechanical filter <NUM> or electric filter <NUM>. UV sanitizing equipment <NUM> may use more time to purify air within fan system <NUM>. A purification system uses at least one of electric filter <NUM>, mechanical filter <NUM>, or UV sanitizing equipment <NUM> based on desired pressure and flow rate, available power sources, desired noise threshold, and other considerations.

As depicted, fan system <NUM> is connected to outlet <NUM> of passenger seat <NUM> to receive power. In some examples, each fan system in number of fan systems <NUM> is powered by a passenger seat outlet. In some examples, fan system <NUM> comprises a female power outlet so that fan system <NUM> does not prevent passenger use of power from outlet <NUM>.

Each air distribution assembly of number of air distribution assemblies <NUM> is configured to be removably installed on a seatback of a passenger seat in set of passenger seats <NUM>. As depicted, air distribution assembly <NUM> is installed on seatback <NUM> of passenger seat <NUM>. As depicted, air distribution assembly <NUM> is installed on seatback <NUM> of passenger seat <NUM>. As depicted, air distribution assembly <NUM> is installed on seatback <NUM> of passenger seat <NUM>.

Each mounting plate of number of mounting plates <NUM> is attached to a respective seat track of number of seat tracks <NUM> in passenger cabin <NUM>. Each fan system of number of fan systems <NUM> is positioned beneath a respective set of passenger seats and connected to a base of a respective mounting plate of the number of mounting plates.

Each of number of mounting plates <NUM> is configured to connect to number of seat tracks <NUM> without interfering with or interacting with number of passenger seats <NUM>. Number of passenger seats <NUM> is connected to number of seat tracks <NUM>. Number of mounting plates <NUM> is connected to number of seat tracks <NUM>. Number of mounting plates <NUM> is not in contact with number of passenger seats <NUM>. Each of number of mounting plates <NUM> is configured such that number of fan systems <NUM> is connected to number of seat tracks <NUM> without contacting set of passenger seats <NUM>. In some examples, each of number of mounting plates <NUM> is configured such that manifold <NUM> can be restrained without contacting set of passenger seats <NUM>.

Each of number of mounting plates <NUM> is configured to provide sufficient support and strength to mount a respective fan system and manifold <NUM> to number of seat tracks <NUM>. At least one of a design of or a material of a respective mounting plate of number of mounting plates <NUM> is selected to reduce the weight of the respective mounting plate. In some examples, cavities are present in a respective mounting plate to reduce weight by reducing the amount of material forming the mounting plate.

As depicted, number of mounting plates <NUM> includes mounting plate <NUM> and mounting plate <NUM>. Mounting plate <NUM> is connected to seat track <NUM> and mounting plate <NUM> is connected to seat track <NUM>. As depicted, fan system <NUM> is connected to base <NUM> of mounting plate <NUM>. By being connected to base <NUM> of mounting plate <NUM>, fan system <NUM> is connected to seat track <NUM>. In this example, number of fan systems <NUM> only includes one fan system, fan system <NUM>. In other non-depicted examples, number of fan systems <NUM> includes more than one fan system. In these examples, the additional fan systems can be connected to the same or different mounting plates. For example, an additional fan system in number of fan systems <NUM> could be connected to base <NUM> of mounting plate <NUM>. In another example, another fan system in number of fan systems <NUM> could be connected to base <NUM> of mounting plate <NUM>.

Further, although only two mounting plates are depicted in number of mounting plates <NUM>, additional mounting plates could be present within number of mounting plates <NUM>. In some examples, another mounting plate could be connected to seat track <NUM> and overlapped with mounting plate <NUM>. In another example, another mounting plate could be connected to seat track <NUM> and overlapped with mounting plate <NUM>.

Mounting plate <NUM> also has positioning feature <NUM>. In some examples, ventilation assembly <NUM> also includes manifold <NUM>. In some examples, manifold <NUM> is optional. Manifold <NUM> is configured to receive purified air from number of fan systems <NUM> and equally distribute the purified air to number of air distribution assemblies <NUM>. Manifold <NUM> is configured to supply air to each air distribution assembly of number of air distribution assemblies <NUM>.

In some examples, positioning feature <NUM> restrains manifold <NUM> within passenger cabin <NUM>. In these examples, manifold <NUM> is connected to seat track <NUM> by mounting plate <NUM>. As depicted, manifold <NUM> is also restrained within passenger cabin <NUM> by positioning feature <NUM>. Mounting plate <NUM> connects manifold <NUM> to seat track <NUM>.

Manifold <NUM> is configured to provide pressure control <NUM> and flow control to each air distribution assembly in number of air distribution assemblies <NUM>. In some examples, manifold <NUM> provides flow control through the use of flow restrictors <NUM>.

Manifold <NUM> comprises flow restrictors configured to equalize or substantially to equalize pressure and flow rate of the air supplied by manifold <NUM> to each air distribution assembly.

Each air distribution assembly of the number of air distribution assemblies comprises a pair of air distribution vents, ductwork configured to receive air from at least one fan system of the number of fan systems and direct air to the pair of air distribution vents, and a seat attachment device configured to removably couple the pair of air distribution vents to the seatback such that each air distribution vent is situated on opposite sides of the seatback for providing purified air to a seated passenger.

In some examples, ventilation assembly <NUM> provides purified air such that the air breathed by a passenger in a passenger seat in set of passenger seats <NUM> is the or substantially the purified air from number of fan systems <NUM>. In some examples, ventilation assembly <NUM> provides a large air movement to divert ambient air away from the passenger. In some examples, ventilation assembly <NUM> provides air to a passenger without causing the feeling of a draft.

The illustration of passenger cabin <NUM> in <FIG> is not meant to imply physical or architectural limitations to the manner in which an example may be implemented. Other components in addition to or in place of the ones illustrated may be used. Some components may be unnecessary. Also, the blocks are presented to illustrate some functional components. One or more of these blocks may be combined, divided, or combined and divided into different blocks when implemented in an example.

For example, only ventilation assembly <NUM> is depicted in <FIG>. Plurality of ventilation assemblies <NUM> comprises any desirable quantity of ventilation assemblies. Further, each of plurality of ventilation assemblies comprises any desirable quantity of fan systems, any desirable quantity of air distribution assemblies, and any desirable quantity of mounting plates. Additional ventilation assemblies of plurality of ventilation assemblies are not depicted only for ease of explanation.

Further, although manifold <NUM> is depicted, manifold <NUM> is optional. Yet further, and as described above, the quantity of air distribution assemblies depicted in number of air distribution assemblies <NUM>, the quantity of fan systems depicted in number of fan systems <NUM>, and the quantity of mounting plates depicted in number of mounting plates <NUM> are not limiting and can be any desirable quantity based on a design of ventilation assembly <NUM>. In some examples, each ventilation assembly of plurality of ventilation assemblies <NUM> has a greater quantity of air distribution assemblies than fan systems.

In some examples, each air distribution assembly of number of air distribution assemblies <NUM> is connected to a single fan system of number of fan systems <NUM>.

Turning now to <FIG>, a block diagram of an air distribution assembly is depicted in accordance with an example. Air distribution assembly <NUM> can be implemented in aircraft <NUM> of <FIG>. Air distribution assembly <NUM> is one of number of air distribution assemblies <NUM> of <FIG>. Air distribution assembly <NUM> is one of number of air distribution assemblies <NUM> of <FIG>.

Air distribution assembly <NUM> is configured to be removably installed on a seatback of a passenger seat. Air distribution assembly comprises pair of air distribution vents <NUM>, seat attachment device <NUM>, and ductwork <NUM>. Seat attachment device <NUM> is configured to encircle a portion of a seatback to removably couple pair of air distribution vents <NUM> to the seatback such that each air distribution vent is situated on opposite sides of the seatback for providing purified air to a seated passenger. Seat attachment device <NUM> is configured to not undesirably interfere with a tray table of a passenger behind the passenger seat. Ductwork <NUM> is configured to receive air from at least one fan system and direct the air to pair of air distribution vents <NUM>. In some examples, ductwork <NUM> is configured to not undesirably interfere with egress from a passenger seat.

To deliver adequate volumes and shapes of air to the passenger's breathing space to displace ambient air, a number of fan systems is configured to provide sufficient air to air distribution assembly <NUM>. Additionally, pair of air distribution vents <NUM> is configured to deliver adequate volumes and shapes of air to the passenger's breathing space to displace ambient air. In some examples, pair of air distribution vents <NUM> have a design configured to provide laminar streams of air. The examples shown provide delivery of purified air that approaches the effectiveness provided by a face mask on a passenger, without the need to wear any mask.

Pair of air distribution vents <NUM> is formed of any desirable material. In some examples, pair of air distribution vents <NUM> is formed of a polymeric material. In some examples, pair of air distribution vents <NUM> is formed of a rigid material. In some examples, pair of air distribution vents <NUM> is formed at least partially of a flexible material.

Pair of air distribution vents <NUM> includes left vent <NUM> and right vent <NUM>. Each air distribution vent comprises an inlet and an opening. Left vent <NUM> has inlet <NUM> connected to ductwork <NUM> and opening <NUM>. In some examples, opening <NUM> takes the form of elongated opening <NUM>. When opening <NUM> takes the form of elongated opening <NUM>, left vent <NUM> can be referred to as a blade vent. Opening <NUM> is configured to provide an airflow to a passenger in the passenger seat having air distribution assembly <NUM>.

Right vent <NUM> has inlet <NUM> connected to ductwork <NUM> and opening <NUM>. In some examples, opening <NUM> takes the form of elongated opening <NUM>. When opening <NUM> takes the form of elongated opening <NUM>, right vent <NUM> can be referred to as a blade vent. Opening <NUM> is configured to provide an airflow to a passenger in the passenger seat having air distribution assembly <NUM>.

Ductwork <NUM> is configured to connect to inlet <NUM> and inlet <NUM> to send purified air from a number of fan systems to left vent <NUM> and right vent <NUM>. Ductwork <NUM> includes any desirable quantity of ducts. Ductwork <NUM> has any desirable physical characteristics. In some examples, ductwork <NUM> is flexible <NUM>. When ductwork <NUM> is flexible <NUM>, ductwork <NUM> can move in response to reclining a seatback. In some examples, ductwork <NUM> is formed of polymeric material <NUM>. In some examples, ductwork <NUM> is formed of fabric <NUM>. Material selections for ductwork <NUM> can be based on at least one of cost, manufacturability, or weight.

Seat attachment device <NUM> is adjustable <NUM> to allow for securing seat attachment device <NUM> onto a seatback. In some examples, seat attachment device <NUM> is adjustable <NUM> to fit seatbacks of different sizes.

Seat attachment device <NUM> comprises one of elastic <NUM>, hook and look fasteners <NUM>, ratchet <NUM>, or strap slide <NUM>. When seat attachment device <NUM> comprises elastic <NUM>, seat attachment device <NUM> is expandable to be placed around a seatback. In some examples, seat attachment device <NUM> is an expandable fabric sleeve comprising elastic <NUM>.

In some examples, hook and loop fasteners <NUM> are connected directly to number of air distribution vents <NUM>. In these examples, hook and loop fasteners <NUM> are also directly connected to the seatback.

In some examples, hook and loop fasteners <NUM> are indirectly connected to number of air distribution vents <NUM>. In these examples, an intermediate component is directly connected to number of air distribution vents <NUM> and is also directly connected to hook and loop fasteners <NUM>. In these examples, at least one dimension of the intermediate component of seat attachment device <NUM> is adjusted through the use of hook and loop fasteners <NUM>. In some of these examples, a length of the intermediate component of seat attachment device <NUM> is adjusted through the use of hook and loop fasteners <NUM>.

Weight <NUM> of air distribution assembly <NUM> is below a threshold weight for recertification of the passenger seat. The threshold weight is a set weight either by value or by percentage of weight of passenger seat over which the passenger seat will have to be recertified. By weight <NUM> being below the threshold weight, air distribution assembly <NUM> can be attached to the passenger seat without recertifying the seat.

Air distribution assembly <NUM> is configured such that when air distribution assembly <NUM> is installed on the seatback of a passenger seat, airflows from pair of air distribution vents <NUM> converge and blend in front of a nose and mouth of a passenger to form a personal breathing space that envelopes an inhalation sphere, impeding transgression of ambient air from crossing through the respective barriers and entering into the personal breathing space, such that the inhalation sphere comprises purified air supplied to air distribution assembly <NUM> by a number of fan systems such that air inhaled by the passenger comes from the inhalation sphere. Air distribution assembly <NUM> is configured to provide airflows from pair of air distribution vents <NUM> that converge and blend by configuring the respective shapes of elongated opening <NUM> and elongated opening <NUM>. Air distribution assembly <NUM> is configured to provide airflows from pair of air distribution vents <NUM> that converge and blend by configuring the positions of left vent <NUM> and right vent <NUM> in air distribution assembly <NUM>.

Turning now to <FIG>, a front isometric view of a set of passenger seats and a ventilation assembly is depicted in accordance with an example. Set of passenger seats <NUM> is present within passenger cabin <NUM>. Set of passenger seats <NUM> is a physical implementation of set of passenger seats <NUM> of <FIG>. In this example, set of passenger seats <NUM> can also be referred to as a row of passenger seats.

Ventilation assembly <NUM> is associated with set of passenger seats <NUM>. Passenger seat <NUM>, passenger seat <NUM>, and passenger seat <NUM> are all connected to set of seat tracks <NUM>. Set of seat tracks <NUM> includes seat track <NUM> and seat track <NUM>.

Ventilation assembly <NUM> includes number of fan systems <NUM>, number of mounting plates <NUM>, and number of air distribution assemblies <NUM>. Number of mounting plates <NUM> connects number of fan systems <NUM> to set of seat tracks <NUM>. Number of fan systems <NUM> and number of mounting plates <NUM> are not in contact with set of passenger seats <NUM>. As depicted, number of air distribution assemblies <NUM> includes air distribution assembly <NUM> attached to seatback <NUM> of passenger seat <NUM>, air distribution assembly <NUM> attached to seatback <NUM> of passenger seat <NUM>, and air distribution assembly <NUM> attached to seatback <NUM> of passenger seat <NUM>.

Turning now to <FIG>, a back isometric view of a set of passenger seats and a ventilation assembly is depicted in accordance with an example. View <NUM> is a view within passenger cabin <NUM>. View <NUM> is a back view of a portion of set of passenger seats <NUM>.

Mounting plate <NUM> of number of mounting plates <NUM> is connected to seat track <NUM>. Mounting plate <NUM> and mounting plate <NUM> of number of mounting plates <NUM> are connected to seat track <NUM>.

Manifold <NUM> connects number of fan systems <NUM> to number of air distribution assemblies <NUM>. Manifold <NUM> distributes purified air from number of fan systems <NUM> to ductwork of number of air distribution assemblies <NUM>.

Manifold <NUM> is not connected to set of passenger seats <NUM>. Each of number of mounting plates <NUM> restrains manifold <NUM> within passenger cabin <NUM>. Each of number of mounting plates <NUM> connects manifold <NUM> to number of seat tracks <NUM>. As depicted, manifold <NUM> extends through a respective positioning feature of each of mounting plate <NUM>, mounting plate <NUM>, and mounting plate <NUM>.

Turning now to <FIG>, a back view of a set of passenger seats and a ventilation assembly is depicted in accordance with an example. View <NUM> is a view of the bottom of set of passenger seats <NUM> within passenger cabin <NUM>. In view <NUM>, each of number of fan systems <NUM> is visible. Number of fan systems <NUM> includes fan system <NUM>, fan system <NUM>, and fan system <NUM>.

Number of air distribution assemblies <NUM> includes ductwork <NUM> that connects to manifold <NUM>. In some examples, ductwork <NUM> is configured to not undesirably interfere with egress from any of the passenger seats in set of passenger seats <NUM>. Material for ductwork <NUM> is selected to provide airflow to number of air distribution assemblies <NUM>. Material for ductwork <NUM> is selected based on weight. Duct <NUM> connects manifold <NUM> to air distribution assembly <NUM>. Ducts <NUM> connect manifold <NUM> to air distribution assembly <NUM> and air distribution assembly <NUM>. Ducts <NUM> are designed to provide air to air distribution assembly <NUM> and air distribution assembly <NUM> without undesirably obstructing movement of passenger seat <NUM> or passenger seat <NUM>. Ducts <NUM> connect manifold <NUM> to air distribution assembly <NUM> and air distribution assembly <NUM>. Ducts <NUM> are designed to provide air to air distribution assembly <NUM> and air distribution assembly <NUM> without undesirably obstructing movement of passenger seat <NUM> or passenger seat <NUM>. Duct <NUM> connects manifold <NUM> to air distribution assembly <NUM>.

Ductwork <NUM> connects number of fan systems <NUM> to manifold <NUM>. Duct <NUM> connects fan system <NUM> to manifold <NUM>. Duct <NUM> connects fan system <NUM> to manifold <NUM>. Duct <NUM> connects fan system <NUM> to manifold <NUM>. In some examples, ductwork <NUM> is configured to not undesirably interfere with egress from any of the passenger seats in set of passenger seats <NUM>.

As depicted, number of fan systems <NUM> provides purified air to manifold <NUM>. Manifold <NUM> distributes the air to ductwork <NUM>. Ductwork <NUM> directs the purified air upward to number of air distribution assemblies <NUM> of <FIG>.

Turning now to <FIG>, a back isometric view of a set of passenger seats and a ventilation assembly is depicted in accordance with an example. View <NUM> is a view of set of passenger seats <NUM> within passenger cabin <NUM>. In view <NUM>, a seat attachment device of each air distribution assembly in number of air distribution assemblies <NUM> is visible. Seat attachment device <NUM> connects air distribution assembly <NUM> to seatback <NUM>. Seat attachment device <NUM> connects air distribution assembly <NUM> to seatback <NUM>. Seat attachment device <NUM> connects air distribution assembly <NUM> to seatback <NUM>. As depicted, each of seat attachment device <NUM>, seat attachment device <NUM>, and seat attachment device <NUM> is an expandable fabric sleeve.

Although each seat attachment device is depicted at a respective headrest of a passenger seat, in some examples, at least air distribution assembly of number of air distribution assemblies <NUM> can be at a different height on a respective seatback. In some examples, ductwork <NUM> is flexible and any of seat attachment device <NUM>, seat attachment device <NUM>, or seat attachment device <NUM> can be lowered along a respective seatback to position the respective air distribution assembly relative to a head of a passenger.

Turning now to <FIG>, an elevated side view of a set of passenger seats and a ventilation assembly is depicted in accordance with an example. View <NUM> is a view of set of passenger seats <NUM> within passenger cabin <NUM>.

As can be seen in view <NUM>, air distribution assembly <NUM> attached to passenger seat <NUM> does not obstruct entry into or exit from set of passenger seats <NUM>. Air distribution assembly <NUM> is connected to headrest <NUM> of passenger seat <NUM>. As depicted, vents of air distribution assembly <NUM> do not extend past headrest <NUM> into a passenger space of passenger seat <NUM>. Ventilation assembly <NUM> does not intrude into passenger spaces of set of passenger seats <NUM>. Ventilation assembly <NUM> provides purified air to personal breathing areas for passengers in set of passenger seats <NUM>.

Turning now to <FIG>, a front view of a set of passenger seats and a ventilation assembly is depicted in accordance with an example. View <NUM> is a front view of set of passenger seats <NUM> within passenger cabin <NUM>.

Each air distribution assembly of ventilation assembly <NUM> is configured to be removably installed on a seatback of a passenger seat. Each air distribution assembly comprises a pair of air distribution vents, a seat attachment device configured to encircle a portion of the seatback to removably couple the pair of air distribution vents to the seatback such that each air distribution vent is situated on opposite sides of the seatback for providing purified air to a seated passenger, and ductwork configured to receive air from at least one fan system and direct the air to the pair of air distribution vents.

Air distribution assembly <NUM> is configured to be removably installed on seatback <NUM> of passenger seat <NUM>. Air distribution assembly <NUM> comprises pair of air distribution vents <NUM>, seat attachment device <NUM>, and ductwork, duct <NUM> and ducts <NUM>. Seat attachment device <NUM> is configured to encircle a portion of seatback <NUM> to removably couple pair of air distribution vents <NUM> to seatback <NUM> such that each air distribution vent is situated on opposite sides of seatback <NUM> for providing purified air to a seated passenger. For example, left vent <NUM> is on an opposite side of seatback <NUM> from right vent <NUM>. Ductwork, duct <NUM> and ducts <NUM>, is configured to receive air from at least one fan system, such as fan system <NUM>, fan system <NUM>, or fan system <NUM> of <FIG>, and direct the air to pair of air distribution vents <NUM>.

Seat attachment device <NUM> takes any desirable form. In <FIG>, seat attachment device <NUM> takes the form of an elastic sleeve. The elastic sleeve expands to encircle headrest <NUM> of passenger seat <NUM> and contracts to hold pair of air distribution vents <NUM> in place against headrest <NUM>.

Air distribution assembly <NUM> is configured to be removably installed on seatback <NUM> of passenger seat <NUM>. Air distribution assembly <NUM> comprises pair of air distribution vents <NUM>, seat attachment device <NUM>, and ductwork, ducts <NUM> and ducts <NUM>. Seat attachment device <NUM> is configured to encircle a portion of seatback <NUM> to removably couple pair of air distribution vents <NUM> to seatback <NUM> such that each air distribution vent is situated on opposite sides of seatback <NUM> for providing purified air to a seated passenger. For example, left vent <NUM> is on an opposite side of seatback <NUM> from right vent <NUM>. Ductwork, ducts <NUM> and ducts <NUM>, is configured to receive air from at least one fan system, such as fan system <NUM>, fan system <NUM>, or fan system <NUM> of <FIG>, and direct the air to pair of air distribution vents <NUM>.

Seat attachment device <NUM> takes any desirable form. In <FIG>, seat attachment device <NUM> takes the form of an elastic sleeve. The elastic sleeve expands to encircle a headrest of passenger seat <NUM> and contracts to hold pair of air distribution vents <NUM> in place against the headrest.

Air distribution assembly <NUM> is configured to be removably installed on seatback <NUM> of passenger seat <NUM>. Air distribution assembly <NUM> comprises pair of air distribution vents <NUM>, seat attachment device <NUM>, and ductwork, ducts <NUM> and duct <NUM>. Seat attachment device <NUM> is configured to encircle a portion of seatback <NUM> to removably couple pair of air distribution vents <NUM> to seatback <NUM> such that each air distribution vent is situated on opposite sides of seatback <NUM> for providing purified air to a seated passenger. For example, left vent <NUM> is on an opposite side of seatback <NUM> from right vent <NUM>. Ductwork, ducts <NUM> and duct <NUM>, is configured to receive air from at least one fan system, such as fan system <NUM>, fan system <NUM>, or fan system <NUM> of <FIG>, and direct the air to pair of air distribution vents <NUM>.

Turning now to <FIG>, a top view of a set of passenger seats and a ventilation assembly is depicted in accordance with an example. View <NUM> is a top view of set of passenger seats <NUM> within passenger cabin <NUM>.

In view <NUM>, boundaries of headrest <NUM> of passenger seat <NUM> are seen. Headrest <NUM> has leading edge <NUM> and leading edge <NUM>. Leading edge boundary <NUM> is an innermost position for a portion of headrest <NUM> into passenger seat <NUM>. Trailing edge boundary <NUM> is an outermost position for a portion of headrest <NUM> on the back of passenger seat <NUM>.

As depicted, left vent <NUM> and right vent <NUM> are mounted between leading edge boundary <NUM> and trailing edge boundary <NUM>. As depicted, left vent <NUM> and right vent <NUM> do not extend past leading edge boundary <NUM>. A passenger seated in passenger seat <NUM> will not inadvertently contact left vent <NUM> or right vent <NUM>. By left vent <NUM> and right vent <NUM> being positioned behind leading edge boundary <NUM>, left vent <NUM> and right vent <NUM> do not interfere with entrance or exit from set of passenger seats <NUM>. By left vent <NUM> and right vent <NUM> being positioned behind leading edge boundary <NUM>, left vent <NUM> and right vent <NUM> do not impact a passenger within passenger seat <NUM>.

Turning now to <FIG>, a side view of a set of passenger seats and a ventilation assembly is depicted in accordance with an example. View <NUM> is a side view of set of passenger seats <NUM> within passenger cabin <NUM>. As can be seen in view <NUM>, left vent <NUM> does not extend past leading edge boundary <NUM>. Additionally, each vent of air distribution assembly <NUM>, air distribution assembly <NUM>, and air distribution assembly <NUM> do not extend past a respective leading-edge boundary of a respective passenger seat. For example, pair of air distribution vents <NUM> do not extend past a respective leading-edge boundary of passenger seat <NUM>. Also, pair of air distribution vents <NUM> do not extend past a respective leading-edge boundary of passenger seat <NUM>.

Turning now to <FIG>, a front view of air distribution vents attached to adjacent passenger seats is depicted in accordance with an example. View <NUM> is a view of right vent <NUM> and left vent <NUM> within passenger cabin <NUM>.

In view <NUM>, a gap is present between right vent <NUM> and left vent <NUM>. As can be seen, right vent <NUM> and left vent <NUM> can pass by each other should passenger seat <NUM> or passenger seat <NUM> be reclined.

The illustration of ventilation assembly <NUM> associated with set of passenger seats <NUM> in <FIG> is not meant to imply physical or architectural limitations to the manner in which an example may be implemented. Other components in addition to or in place of the ones illustrated may be used. Some components may be unnecessary.

For example, there could be any desirable quantity of fan systems in number of fan systems <NUM>. In some examples, manifold <NUM> is optional. The quantity of inlets and quantity of outlets in manifold <NUM> can be different than depicted in <FIG> to accommodate the quantity of air distribution assemblies, the quantity of ducts, and the quantity of fan systems provided.

As depicted, each of seat attachment device <NUM>, seat attachment device <NUM>, and seat attachment device <NUM> is an expandable fabric sleeve. In some examples, any of seat attachment device <NUM>, seat attachment device <NUM>, and seat attachment device <NUM> can have a different design, such as a slipcover that covers at least a portion of the top of a head rest, a ratcheted belt, a strap slide, or other desirable design. A slipcover that covers at least a portion of the top of a head rest could be used as a seat attachment device that indexes the height of the air distribution device to a set height on the respective passenger seat. In these examples, the portion of the slipcover that covers a portion of the head rest limits the movement of the slipcover downward.

As yet another example, any of the seat attachment devices can be moved along a respective seatback to desirably position a respective air distribution assembly based on a height of a passenger. For example, one of number of air distribution assemblies <NUM> can be slid downward to position the respective air distribution assembly for a child.

In other examples, more than one air distribution assembly is associated with a passenger seat. In some examples, a first air distribution assembly is positioned for an adult height and a second air distribution assembly is positioned on the same passenger seat for a child's height.

In some examples, set of passenger seats <NUM> can include more or fewer passenger seats than three passenger seats. Although set of passenger seats <NUM> is a row of passenger seats, a set of passenger seats can have less than a full row of passenger seats. In some examples, set of passenger seats <NUM> is a single seat, such as passenger seat <NUM>. In some examples, set of passenger seats <NUM> includes seats from more than one row of passenger seats.

Additionally, although ductwork <NUM> is shown as flexible, in some examples, ductwork <NUM> can be rigid. As depicted, ductwork <NUM> includes ducts <NUM> that provide air to more than one air distribution assembly. In some non-depicted examples, ductwork <NUM> includes only ducts that provide air to a single air distribution assembly.

Turning now to <FIG>, an isometric back view of a ventilation assembly is depicted in accordance with an example. Ventilation assembly <NUM> in view <NUM> is a physical implementation of ventilation assembly <NUM> of <FIG>. Ventilation assembly <NUM> in view <NUM> is a physical implementation of ventilation assembly <NUM> of <FIG>.

Ventilation assembly <NUM> is associated with set of passenger seats <NUM>. Leg <NUM> and leg <NUM> mount set of passenger seats <NUM> to number of seat tracks, seat track <NUM> and seat track <NUM>. Manifold <NUM> and number of fan systems <NUM> are mounted to seat track <NUM> and seat track <NUM> independently of set of passenger seats <NUM>. Manifold <NUM> and number of fan systems <NUM> are mounted to seat track <NUM> and seat track <NUM> by number of mounting plates <NUM>.

Turning now to <FIG>, an isometric back view of a ventilation assembly is depicted in accordance with an example. Ventilation assembly <NUM> in view <NUM> is a physical implementation of ventilation assembly <NUM> of <FIG>. Ventilation assembly <NUM> in view <NUM> is a physical implementation of ventilation assembly <NUM> of <FIG>. Ventilation assembly <NUM> includes mounting plate <NUM> with base <NUM> and positioning feature <NUM>. Base <NUM> is configured to be connected to fan system <NUM>. As depicted, fan system <NUM> is connected to seat track <NUM> by mounting plate <NUM>.

Positioning feature <NUM> is configured to restrain manifold <NUM> within passenger cabin <NUM>. Mounting plate <NUM> connects manifold <NUM> to seat track <NUM> in passenger cabin <NUM>. As depicted, manifold <NUM> extends through positioning feature <NUM> of mounting plate <NUM>.

Turning now to <FIG>, an isometric view of mounting plates of a ventilation assembly is depicted in accordance with an example. Number of mounting plates <NUM> can be used in aircraft <NUM> of <FIG>. Number of mounting plates <NUM> is a physical implementation of number of mounting plates <NUM> of <FIG>. Number of mounting plates <NUM> is a physical implementation of number of mounting plates <NUM> of <FIG>. In some examples, number of mounting plates <NUM> is a portion of number of mounting plates <NUM> of <FIG>. In some examples, number of mounting plates <NUM> is a portion of number of mounting plates <NUM> of <FIG>.

Mounting plate <NUM> of ventilation assembly <NUM> comprises base <NUM> and positioning feature <NUM>. Base <NUM> is configured to connect to fan system <NUM>. Mounting plate <NUM> is designed based on a design of fan system <NUM> and a design of manifold <NUM>. Mounting plate <NUM> is configured to provide sufficient support and strength to mount fan system <NUM> and manifold <NUM> to seat track <NUM>. At least one of a design or a material of mounting plate <NUM> is selected to reduce the weight of mounting plate <NUM>. In some examples, cavities are present in mounting plate <NUM> to reduce weight by reducing the amount of material forming mounting plate <NUM>.

In some examples, mounting plate <NUM> is formed of a metal. In some examples, mounting plate <NUM> is formed of aluminum or an aluminum alloy based on cost, weight, and strength. In some examples, mounting plate is formed of a composite material.

Turning now to <FIG>, an exploded view of components of a ventilation assembly is depicted in accordance with an example. View <NUM> is a view of the components of a ventilation assembly that are mounted to seat tracks within a passenger cabin of an aircraft. Components <NUM> in view <NUM> are physical implementations of number of fan systems <NUM>, number of mounting plates <NUM>, and manifold <NUM> in <FIG>. Components <NUM> in view <NUM> are physical implementations of number of fan systems <NUM>, number of mounting plates <NUM>, and manifold <NUM> of <FIG>. Components <NUM> can be used with air distribution assembly <NUM> of <FIG> to form a ventilation assembly. In some examples, view <NUM> is an exploded view of components of ventilation assembly <NUM> of <FIG>. In some examples, view <NUM> is an exploded view of ventilation assembly <NUM> of <FIG>. In some examples, fan system <NUM> and mounting plate <NUM> can be some of components <NUM> of <FIG>.

Components <NUM> include components of a ventilation assembly that are connected either directly or indirectly to number of seat tracks <NUM>. Number of seat tracks <NUM> include seat track <NUM> and seat track <NUM>. Each of number of mounting plates <NUM> is connected directly to one of number of seat tracks <NUM>. Number of mounting plates <NUM> includes mounting plate <NUM>, mounting plate <NUM>, and mounting plate <NUM>. Each of mounting plates is connected to a respective seat track at two locations for stability. However, in other examples, a mounting plate can include more or less than two connections per mounting plate.

Each of number of mounting plates is configured to support a respective fan system and manifold <NUM>. Each of number of mounting plates has a base to connect to a respective fan system of number of fan systems <NUM>. Number of fan systems <NUM> includes fan system <NUM>, fan system <NUM>, and fan system <NUM>.

Mounting plate <NUM> is configured to connect to fan system <NUM> and join fan system <NUM> to seat track <NUM>. Mounting plate <NUM> is configured to connect to fan system <NUM> and join fan system <NUM> to seat track <NUM>. Mounting plate <NUM> is configured to connect to fan system <NUM> and join fan system <NUM> to seat track <NUM>.

As depicted, fan system <NUM> is partially exploded to demonstrate the separate purification and fan/motor components. The fan and motor will pull the air through the purification component and send the purified air out of the fan and motor portion to ductwork.

Manifold <NUM> is configured to extend through and be restrained by number of mounting plates <NUM>. Each of number of mounting plates <NUM> is configured such that manifold <NUM> can be restrained without contacting any neighboring passenger seats.

Manifold <NUM> has a different design than manifold <NUM> of <FIG>. In some examples, manifold <NUM> is an alternative to manifold <NUM> depicted in <FIG>. Manifold <NUM> has a respective inlet for each of number of fan systems <NUM>. As depicted, manifold <NUM> has outlet <NUM>, outlet <NUM>, outlet <NUM>, outlet <NUM>, outlet <NUM>, and outlet <NUM>. In this example, each air distribution system assembly will be connected to more than one outlet. For example, ducts (not depicted) will connect outlet <NUM> and outlet <NUM> to a first air distribution assembly. As another example, ducts (not depicted) will connect outlet <NUM>, outlet <NUM> to a second air distribution assembly. As depicted, each outlet of manifold <NUM> is connected to a single air distribution assembly. In <FIG>, some outlets of manifold <NUM> provide air to more than one air distribution assembly.

The illustration of components <NUM> in <FIG> is not meant to imply physical or architectural limitations to the manner in which an example may be implemented. Other components in addition to or in place of the ones illustrated may be used. Some components may be unnecessary. In some examples, manifold <NUM> is not present.

In some non-depicted examples, there are fewer fan systems than there are mounting plates. In these examples, at least one mounting plate is not configured to support a fan system. In some examples, one of number of fan systems <NUM> can have a different design than at least one other fan system in number of fan systems <NUM>.

Turning now to <FIG>, a back view of a ventilation assembly is depicted in accordance with an example. Ventilation assembly <NUM> can be used in aircraft <NUM> of <FIG>. Ventilation assembly <NUM> is a physical implementation of ventilation assembly <NUM> of <FIG>. Ventilation assembly <NUM> is a physical implementation of ventilation assembly <NUM> of <FIG>. Components of ventilation assembly <NUM> can be used with air distribution assembly <NUM> of <FIG>. Ventilation assembly <NUM> can be an alternate design for number of fan systems <NUM> and number of mounting plates <NUM> to be used in ventilation assembly <NUM> of <FIG>.

Ventilation assembly <NUM> is associated with set of passenger seats <NUM>. Ventilation assembly <NUM> comprises number of fan systems <NUM> and number of mounting plates <NUM>. Number of mounting plates <NUM> is connected to number of seat tracks <NUM>. Ductwork <NUM> connects number of fan systems <NUM> to a number of air distribution assemblies. In some examples, ductwork <NUM> is configured to not undesirably interfere with egress from any of the passenger seats in set of passenger seats <NUM>.

In this example, number of fan systems <NUM> comprises three fan systems. Purified air is sent from fan system <NUM> through duct <NUM> to an air distribution assembly (not depicted). Fan system <NUM> is connected to mounting plate <NUM>. Mounting plate <NUM> connects fan system <NUM> to seat track <NUM>.

Purified air is sent from fan system <NUM> through duct <NUM> to an air distribution assembly (not depicted). Fan system <NUM> is connected to mounting plate <NUM>. Mounting plate <NUM> connects fan system <NUM> to seat track <NUM>. Mounting plate <NUM> overlaps mounting plate <NUM>.

Purified air is sent from fan system <NUM> through duct <NUM> to an air distribution assembly (not depicted). Fan system <NUM> is connected to mounting plate <NUM>. Mounting plate <NUM> connects fan system <NUM> to seat track <NUM>.

In this example, purified air from a fan system is directed to a respective air distribution assembly. In this example, a manifold is not present in ventilation assembly <NUM>.

Ventilation assembly <NUM> is associated with set of passenger seats <NUM>. Ventilation assembly <NUM> comprises number of fan systems <NUM> and number of mounting plates <NUM>. Number of mounting plates <NUM> is configured to connected to number of seat tracks <NUM>.

Number of fan systems <NUM> includes fan system <NUM>. In this example, fan system <NUM> is the only fan system in ventilation assembly <NUM>. Fan system <NUM> is selected based on weight, power usage, pressure and flow rate, and noise. Ductwork <NUM> connects fan system <NUM> to manifold <NUM>. Manifold <NUM> is configured to distribute purified air from fan system <NUM> to multiple air distribution assemblies.

In this example, fan system <NUM> is restrained in passenger cabin <NUM> by mounting plate <NUM>. Mounting plate <NUM> connects fan system <NUM> to seat track <NUM>. Mounting plate <NUM> also restrains manifold <NUM> within passenger cabin <NUM>. Mounting plate <NUM> connects manifold <NUM> to seat track <NUM>.

Mounting plate <NUM> is connected to seat track <NUM>. No fan system is connected to mounting plate <NUM>. Mounting plate <NUM> restrains manifold <NUM> within passenger cabin <NUM>. Mounting plate <NUM> connects manifold <NUM> to seat track <NUM>.

Turning now to <FIG>, an isometric view of an air distribution assembly is depicted in accordance with an example. Air distribution assembly <NUM> can be used in aircraft <NUM> of <FIG>. Air distribution assembly <NUM> is a physical implementation of one of number of air distribution assemblies <NUM> of <FIG>. Air distribution assembly <NUM> is a physical implementation of one of number of air distribution assemblies <NUM> of <FIG>. Air distribution assembly <NUM> is a physical implementation of air distribution assembly <NUM> of <FIG>. Air distribution assembly <NUM> can be an alternate design for an air distribution assembly to be used in ventilation assembly <NUM> of <FIG>. Air distribution assembly <NUM> can be used in ventilation assembly <NUM> of <FIG>. Air distribution assembly <NUM> can be used in ventilation assembly <NUM> of <FIG>. Air distribution assembly <NUM> can be used in a ventilation assembly along with number of mounting plates <NUM> of <FIG>. Air distribution assembly <NUM> can be used with components <NUM> of <FIG> in a ventilation assembly. Air distribution assembly <NUM> can be used in ventilation assembly <NUM> of <FIG>. Air distribution assembly <NUM> can be used in ventilation assembly <NUM> of <FIG>.

Air distribution assembly <NUM> comprises pair of air distribution vents <NUM> and seat attachment device <NUM>. Seat attachment device <NUM> is configured to removably couple pair of air distribution vents <NUM> to a seatback such that each air distribution vent is situated on opposite sides of the seatback for providing purified air to a seated passenger. In this example, seat attachment device <NUM> comprises ratchet belt <NUM>. Ratchet belt <NUM> includes ratchet <NUM> and belt <NUM>. Ratchet <NUM> allows for seat attachment device <NUM> to be adjustable. Ratchet <NUM> can be used to adjust a length of belt <NUM> used to encircle the seatback of the passenger seat.

Belt <NUM> is formed of any desirable material. In some examples, material of belt <NUM> is selected based on weight. In some examples, belt <NUM> comprises elastic material. In some examples, material for belt <NUM> is selected to be a non-stretch material.

In this example, positions of pair of air distribution vents <NUM> are adjustable along belt <NUM>. Each of pair of air distribution vents <NUM> is connected to belt <NUM> by a respective slider. Left vent <NUM> is connected to belt <NUM> by slider <NUM>. Right vent <NUM> is connected to belt <NUM> by slider <NUM>.

Although ductwork is not depicted in <FIG>, any desirable design of ductwork can be used to provide purified air to pair of air distribution vents <NUM>. In some examples, flexible ductwork is used to provide purified air to pair of air distribution vents <NUM>.

Turning now to <FIG>, an isometric view of an air distribution assembly is depicted in accordance with an example. Air distribution assembly <NUM> can be used in aircraft <NUM> of <FIG>. Air distribution assembly <NUM> is a physical implementation of one of number of air distribution assemblies <NUM> of <FIG>. Air distribution assembly <NUM> is a physical implementation of one of number of air distribution assemblies <NUM> of <FIG>. Air distribution assembly <NUM> is a physical implementation of air distribution assembly <NUM> of <FIG>. Air distribution assembly <NUM> can be an alternate design for an air distribution assembly to be used in ventilation assembly <NUM> of <FIG>. Air distribution assembly <NUM> can be used in ventilation assembly <NUM> of <FIG>. Air distribution assembly <NUM> can be used in ventilation assembly <NUM> of <FIG>. Air distribution assembly <NUM> can be used in a ventilation assembly along with number of mounting plates <NUM> of <FIG>. Air distribution assembly <NUM> can be used with components <NUM> of <FIG> to form a ventilation assembly. Air distribution assembly <NUM> can be used in ventilation assembly <NUM> of <FIG>. Air distribution assembly <NUM> can be used in ventilation assembly <NUM> of <FIG>.

Air distribution assembly <NUM> comprises pair of air distribution vents <NUM> and seat attachment device <NUM>. Seat attachment device <NUM> is configured to removably couple pair of air distribution vents <NUM> to a seatback such that each air distribution vent is situated on opposite sides of the seatback for providing purified air to a seated passenger. In this example, seat attachment device <NUM> comprises slipcover <NUM>. In some examples, slipcover <NUM> comprises an elastic material. When present, elastic allows for seat attachment device <NUM> to be adjustable. When slipcover <NUM> comprises an elastic material, slipcover <NUM> can be expanded to encircle seatback <NUM> of a passenger seat <NUM>.

In this example, positions of pair of air distribution vents <NUM> are set within slipcover <NUM>. Each of pair of air distribution vents <NUM> is directly connected to slipcover <NUM>. Left vent <NUM> and right vent <NUM> receive purified air from ductwork <NUM>. In this example, ductwork <NUM> is flexible.

Slipcover <NUM> covers headrest <NUM> of passenger seat <NUM>. Slipcover <NUM> is designed to position left vent <NUM> and right vent <NUM> at a set height of seatback <NUM> of passenger seat <NUM>. By covering the top of headrest <NUM> seat attachment device <NUM> indexes the height of air distribution device <NUM> to a set height on passenger seat <NUM>.

Turning now to <FIG>, a top view of an air distribution assembly attached to a passenger seat is depicted in accordance with an example. View <NUM> can be a view within aircraft <NUM> of <FIG>. Ventilation assembly <NUM> is a physical implementation of ventilation assembly <NUM> of <FIG>. Ventilation assembly <NUM> is a physical implementation of ventilation assembly <NUM> of <FIG>. Components of ventilation assembly <NUM> are physical implementations of air distribution assembly <NUM> of <FIG>. In some examples, ventilation assembly <NUM> can be the same as ventilation assembly <NUM> of <FIG>. Ventilation assembly <NUM> can include any of the number of fan system designs and any of the mounting plate designs depicted in <FIG>. Any of air distribution assembly <NUM> of <FIG> air distribution assembly <NUM> of <FIG> can be utilized in ventilation assembly <NUM> of <FIG>.

<FIG> depicts an overhead view of a breathing space that may be filled and isolated by a first airflow and a second airflow, in accordance with an example. More specifically, <FIG> depicts ventilation assembly <NUM> having air distribution assembly <NUM>. Air distribution assembly <NUM> comprises pair of air distribution vents <NUM>. Pair of air distribution vents <NUM> include left vent <NUM> and right vent <NUM> on opposite sides of headrest <NUM> of passenger seat <NUM>.

Pair of air distribution vents <NUM> are configured to and positioned to create a triangular pattern of clean airflow. Each of air distribution vents <NUM> is configured such that the purified air diverges into the triangular airflow. Left vent <NUM> is configured to generate airflow <NUM>. Right vent <NUM> is configured to generate airflow <NUM>.

Airflow <NUM> may combine with airflow <NUM> to form breathing space <NUM>, in accordance with an example. An outside edge of airflow <NUM> can function as barrier <NUM>. An outside edge of airflow <NUM> may function as barrier <NUM>.

The examples create a larger area flow that helps to divert ambient air <NUM> away from passenger <NUM>. Left vent <NUM> and right vent <NUM> produce airflow <NUM> and airflow <NUM> that displace ambient air <NUM> in breathing space <NUM> with purified air supplied to air distribution assembly <NUM>. Ambient air <NUM> is air outside of breathing space <NUM>. Ambient air <NUM> may be a cabin air that occupies the same volume of space that becomes breathing space <NUM> before left vent <NUM> and right vent <NUM> begin to operate and create breathing space <NUM> by displacing the cabin air in that space with purified air. Thus, airflow <NUM> and airflow <NUM> can suffuse or substantially fill breathing space <NUM> with purified air.

The examples can eject exhaled air <NUM> of passenger <NUM> forward. But at the same time the triangular flow created by air distribution assembly <NUM> tends to overwhelm any ambient air entering from behind passenger seat <NUM> and leaves passenger <NUM> with a pocket of clean filtered air in inhalation sphere <NUM>. Inhalation sphere <NUM> may be a volume of air that may be inhaled by passenger <NUM> through their mouth and/or nose.

Breathing space <NUM> may occupy a volume of air that may provide a source of air that may suffuse or fill and envelope inhalation sphere <NUM> for passenger <NUM>. To create breathing space <NUM> of purified air that will envelope a full range of sizes and locations for inhalation sphere <NUM> for different passenger sizes, the breathing space <NUM> may be either adjustable for each individual passenger, envelope the entire dimensions of all the possible inhalation spheres, or some combination thereof. If the breathing space <NUM> is adjustable, envelopes the dimensions for all possible inhalation spheres, or some combination thereof the inhalation sphere of a particular passenger has purified air delivered to suffuse or to fully occupy the dimensions of the particular passenger's inhalation sphere <NUM>. In some examples, breathing space <NUM> is adjustable by adjusting a position of air distribution assembly <NUM> along a height of the seatback of passenger seat <NUM>.

Any contaminants present in the ambient air that enters breathing space <NUM> are dissipated and made significantly rarer by movement and volume of airflow <NUM> and airflow <NUM>. Broader air patterns and overwhelming the area around a passenger's face with purified air is effective at providing protection from potential contamination in the ambient air that has yet to be filtered by personal or aircraft wide environmental systems. In some examples, airflow <NUM> and airflow <NUM> provide obstacles equivalent to a face mask worn by a passenger.

Airflow <NUM> and airflow <NUM> are directed such that the edges of airflow <NUM> and airflow <NUM> barely pass by the front of the cheeks and ears of passenger <NUM>. Passengers have a high sensitivity to air motion and temperature. Strong flow directly onto passenger <NUM> can cause passenger <NUM> to feel chilled or feel a draft. Airflow <NUM> and airflow <NUM> provides substantial amounts of purified air to passenger <NUM> and moves the air to divert ambient air <NUM> away from passenger <NUM>. Airflow <NUM> and airflow <NUM> provides benefit without causing discomfort to the passenger.

Breathing space may be bounded by barrier <NUM> and by barrier <NUM>. Each barrier can at least partially impede transgression of ambient air <NUM> from crossing through the respective barrier and entering into breathing space <NUM>. Each barrier, barrier <NUM> and barrier <NUM> may retain purified air from crossing through the respective barrier and exiting breathing space <NUM>.

Purified air can be delivered from a purified air source. The purified air source may provide air that is free or substantially free of virus and/or bacterial contaminants or other allergens and/or irritants that may come from any origin, such as without limitation, the exhalation of any other person, or any item, clothing, and/or skin of anyone near and/or in passenger seat or the passenger cabin, in accordance with an example.

Left vent <NUM> and right vent <NUM> may be of similar design and/or construction, of inverse design and/or construction relative to each other, of unique design and/or construction relative to each other, or of any combination thereof. Each vent may include, an outlet, a nozzle, an airflow guide system, a baffle, or any structure such that airflow exiting each vent may exit with a desired shape, pressure and flow rate, and velocity distribution to provide breathing space <NUM>.

Airflow <NUM> and airflow <NUM> substantially suffuse or fills inhalation sphere <NUM> within breathing space <NUM> with purified air. In some examples, ambient air <NUM> outside of breathing space <NUM> may not be entrained into airflow <NUM> or airflow <NUM> or be able to cross through airflow <NUM> or airflow <NUM> into breathing space <NUM>.

Turning now to <FIG>, an illustration of a flowchart of a method of installing a ventilation assembly is depicted in accordance with an example. Method <NUM> can be used to install a ventilation assembly in aircraft <NUM> of <FIG>. Method <NUM> can be used to install ventilation assembly <NUM> of <FIG>. Method <NUM> can be used to install a ventilation assembly within aircraft <NUM> of <FIG>. Method <NUM> can be used to install a ventilation assembly including air distribution assembly <NUM> of <FIG>. Method <NUM> can be used to install ventilation assembly <NUM> of <FIG>. Method <NUM> can be used to install ventilation assembly <NUM> in <FIG>. Method <NUM> can be used to install ventilation assembly <NUM> in <FIG>. Method <NUM> can be used to install a ventilation assembly including mounting plate <NUM> and mounting plate <NUM> in <FIG>. Method <NUM> can be used to install components <NUM> of <FIG>. Method <NUM> can be used to install ventilation assembly <NUM> in <FIG>. Method <NUM> can be used to install ventilation assembly <NUM> in <FIG>. Method <NUM> can be used to install a ventilation assembly with air distribution assembly <NUM> in <FIG>. Method <NUM> can be used to install a ventilation assembly with air distribution assembly <NUM> in <FIG>. Method <NUM> can be used to install ventilation assembly <NUM> in <FIG>.

Method <NUM> secures a number of fan systems to a number of seat tracks and beneath a set of passenger seats in an aircraft (operation <NUM>). The number of fan systems comprises any quantity of fan systems. By the number of fan systems being mounted to the seat tracks, the weight of the load of the number of fan systems is not carried through the passenger seats.

Method <NUM> removably connects a number of air distribution assemblies to seatbacks of passenger seats in the set of passenger seats (operation <NUM>). The number of air distribution assemblies is removably connected by a seat attachment device. Method <NUM> connects ductwork of the number of air distribution assemblies to the number of fan systems (operation <NUM>). Afterwards, method <NUM> terminates.

By connecting the ductwork to the number of fan systems, the purified air from the number of fan systems will be delivered to the number of air distribution assemblies. The ductwork can be either directly or indirectly connected to the number of fan systems.

A first component is considered to be indirectly connected to a second component when one or more additional components are present between the two components. When the first component is directly connected to the second component, no additional components are present between the two components.

In some examples, securing the number of fan systems to the number of seat tracks comprises connecting a number of mounting plates to the number of seat tracks (operation <NUM>). In some examples, method <NUM> secures a manifold to the number of seat tracks (operation <NUM>). In some examples, method <NUM> connects the number of fan systems to the manifold such that output from the number of fan systems enters the manifold (operation <NUM>). In some examples, connecting the ductwork of the number of air distribution assemblies to the number of fan systems comprises connecting the ductwork to the manifold (operation <NUM>).

In some examples, securing the number of fan systems to the number of seat tracks comprises connecting a number of mounting plates to the number of seat tracks (operation <NUM>). In some examples, securing the manifold to the number of seat tracks comprises securing the manifold using the number of mounting plates (operation <NUM>).

In some examples, removably connecting the number of air distribution assemblies to the seatbacks of the passenger seats in the set of passenger seats comprises at least one of extending or contracting an attachment system to encircle a portion of a respective seatback (operation <NUM>). In some examples, removably connecting the number of air distribution assemblies to the seatbacks of the passenger seats positions a pair of air distribution vents of each air distribution assembly of the number of air distribution assemblies on opposite sides of the seatback for providing purified air to a seated passenger (operation <NUM>).

In some examples, each air distribution assembly of the number of air distribution assemblies comprises a pair of air distribution vents, wherein removably connecting the number of air distribution assemblies to the seatbacks of the passenger seats comprises removably connecting each air distribution assembly of the number of air distribution assemblies to a respective passenger seat such that the air distribution assembly is positioned to direct airflows from the pair of air distribution vents to converge and blend in front of a nose and mouth of a passenger to form a personal breathing space that envelopes an inhalation sphere, impeding transgression of ambient air from crossing through the respective barriers and entering into the personal breathing space, such that the inhalation sphere comprises purified air supplied to the air distribution assembly by the number of fan systems such that air inhaled by the passenger comes from the inhalation sphere (operation <NUM>). Although the airflows will not prevent all ambient air from entering the personal breathing space, the movement of the airflows will divert ambient air away from the personal breathing space. Additionally, although the airflows will not prevent all ambient air from entering the personal breathing space, the moving airflow will significantly dissipate any ambient air that is able to enter the personal breathing space. The airflow will effectively overwhelm the space around a passenger's face with purified air.

The flowcharts and block diagrams in the different depicted examples illustrate the architecture, functionality, and operation of some possible implementations of apparatuses and methods in an example. In this regard, each block in the flowcharts or block diagrams may represent at least one of a module, a segment, a function, or a portion of an operation or step.

In some alternative implementations of an example, the function or functions noted in the blocks may occur out of the order noted in the figures. For example, in some cases, two blocks shown in succession may be executed concurrently or substantially concurrently, or the blocks may sometimes be performed in the reverse order, depending upon the functionality involved. Also, other blocks may be added in addition to the illustrated blocks in a flowchart or block diagram. Some blocks may be optional. For example, any of operation <NUM> through operation <NUM> may be optional.

Examples of the present disclosure may be described in the context of aircraft manufacturing and service method <NUM> as shown in <FIG> and aircraft <NUM> as shown in <FIG>. Turning first to <FIG>, an illustration of an aircraft manufacturing and service method is depicted in accordance with an example. During pre-production, aircraft manufacturing and service method <NUM> may include specification and design <NUM> of aircraft <NUM> in <FIG> and material procurement <NUM>.

During production, component and subassembly manufacturing <NUM> and system integration <NUM> of aircraft <NUM> takes place. Thereafter, aircraft <NUM> may go through certification and delivery <NUM> in order to be placed in service <NUM>. While in service <NUM> by a customer, aircraft <NUM> is scheduled for routine maintenance and service <NUM>, which may include modification, reconfiguration, refurbishment, or other maintenance and service.

With reference now to <FIG>, an illustration of an aircraft is depicted in which an example may be implemented. In this example, aircraft <NUM> is produced by aircraft manufacturing and service method <NUM> of <FIG> and may include airframe <NUM> with plurality of systems <NUM> and interior <NUM>. Examples of systems <NUM> include one or more of propulsion system <NUM>, electrical system <NUM>, hydraulic system <NUM>, and environmental system <NUM>. Any number of other systems may be included.

Apparatuses and methods embodied herein may be employed during at least one of the stages of aircraft manufacturing and service method <NUM>. One or more examples may be manufactured or used during at least one of component and subassembly manufacturing <NUM>, system integration <NUM>, in service <NUM>, or maintenance and service <NUM> of <FIG>.

Ventilation assemblies, such as ventilation assembly <NUM> can be used to provide purified air during in service <NUM>. A ventilation assembly, such as ventilation assembly <NUM>, can be installed during maintenance and service <NUM>. Method <NUM> can be performed during component and subassembly manufacturing <NUM>. Method <NUM> can be performed during maintenance and service <NUM>.

The examples provide retrofit ventilation assemblies. The examples may provide lighter ventilation assemblies than built-in integrated ventilation seats. The examples can be quickly added to existing passenger seats. The examples provide a modular set of equipment that can be used on variety of different designs of passenger seats. The examples provide novel ways to design a ventilation assembly such that it can be pre-assembled and easily slipped onto existing seating.

The examples are split up into two major sets of components, components connected to a passenger seat and components mounted to seat tracks. The components connected to the passenger seat are beneath a threshold weight restriction of what can be added onto any passenger seat without causing major redesign or recertification.

An air distribution assembly is a portion of the ventilation assembly configured to connect to a passenger seat. The air distribution assembly has a seat attachment device to connect the air distribution assembly to the passenger seat. The seat attachment device takes any desirable form that adjusts to encircle a portion of the passenger seat. In some examples, a "sock" slipcover design is present that includes the head rest clean air venting. In some examples, the slipcover includes integrated ducting and/or fabric ducting and can easily be slipped over existing seats and held in place with elastic, straps or Velcro.

The ventilation assembly also includes mounting plates that bolt down to the existing seat tracks fore and aft of the existing seat attach points. Heavier items such as fans, filters and manifolds are attached to the mounting plates. Loading is therefore carried through to the seat tracks, thereby eliminating it as a concern for excess loading on existing seat designs. By components being connected to the seat tracks, the examples present a retrofit that would not require a complete recertification of existing passenger seats. The examples include fans, filters and sound muffling mounted at floor level. The air moving equipment would be powered by passenger seat power, which is an option purchased by many Boeing customers.

Claim 1:
A ventilation assembly (<NUM>, <NUM>) comprising:
a number of fan systems (<NUM>, <NUM>) configured to purify air; and
a number of air distribution assemblies (<NUM>, <NUM>), each air distribution assembly (<NUM>) of the number of air distribution assemblies (<NUM>, <NUM>) configured to be removably installed on a seatback (<NUM>, <NUM>, <NUM>) of a passenger seat (<NUM>, <NUM>, <NUM>), and each air distribution assembly (<NUM>) of the number of air distribution assemblies (<NUM>, <NUM>) comprising:
a pair of air distribution vents (<NUM>);
ductwork (<NUM>) configured to receive air from at least one fan system of the number of fan systems (<NUM>, <NUM>) and direct air to the pair of air distribution vents (<NUM>); and
a seat attachment device (<NUM>) configured to removably couple the pair of air distribution vents (<NUM>) to the seatback (<NUM>, <NUM>, <NUM>) such that each air distribution vent is situated on opposite sides of the seatback (<NUM>, <NUM>, <NUM>) for providing purified air to a seated passenger (<NUM>); and
wherein the ventilation assembly further comprises a number of mounting plates (<NUM>), wherein each mounting plate (<NUM>) of the number of mounting plates (<NUM>) is configured to attach to a seat track (<NUM>) of an aircraft (<NUM>, <NUM>), and wherein each mounting plate (<NUM>) of the number of mounting plates (<NUM>) comprises a base (<NUM>) configured to join to a fan system (<NUM>) of the number of fan systems (<NUM>, <NUM>).