## Appendix A Technical Specifications of Module Components  
The detailed structural configuration of the smart diffuser-integrated ventilation module is illustrated in Figure 2 (Section 2.4), comprising a sectional perspective (left) and a vertical cross-section (right). The device architecture incorporates multiple subsystems that collectively enable motorized filtration, directional ventilation, and system-integrated monitoring. Key numbered components and their technical functions are as follows:  
* (10) Housing: The primary structural enclosure that supports all internal subsystems.
* (10a) Guide Rails: Linear guide elements embedded symmetrically along the inner wall of the housing, enabling stabilized vertical translation of the filter assembly.
* (12) Upper Cover: A removable lid allowing access to internal electronics, including the motor controller PCB (43).
* (13) Insertion Section: A recessed compartment designed to accommodate the display module (60) during filter retraction, allowing flush alignment with the ceiling surface.
* (14) Ceiling Mount Interface: Mechanical flange region at the housing base, configured for suspension-based mounting to overhead ceiling structures.
* (20) Duct Connector: Provides physical and aerodynamic coupling to HVAC or ERV ductwork; houses the fan assembly (30-32).
* (21) Internal Fastening Points: Threaded anchor positions for fixing the fan motor bracket (32) to the duct connector body.  
* (30) Fan Motor, (31) Fan Blade, (32) Motor Bracket: These components form the forced-air circulation unit, with the motor and impeller secured externally to minimize thermal and vibrational interference with the filter mechanism.
* (40) Lifting Motor: A vertically mounted actuator fixed via a support bracket (42), tasked with controlling filter elevation.
* (41) Lead Screw: Coupled to the lifting motor to provide rotational-to-linear motion conversion.
* (42) Motor Bracket: Anchors the lifting motor to the upper housing wall; also serves as a vibration isolation interface.
* (43) Motor Control PCB: Mounted above the lifting motor to execute motion logic, position sensing, and overload protection.
* (50) Filter Housing: Cylindrical sleeve enclosing the air filter unit; externally vented via distributed perforations (50b).
* (50a) Rail Grooves: Precisely milled slots along the filter housing exterior, allowing guided motion along the housing rails (10a).
* (51) Cylindrical Filter Element: The primary particulate filtration medium, optimized for minimal pressure drop and maximal surface area.
* (52) Embedded Nut: Rigidly mounted within the screw bracket (53), this component travels along the lead screw (41) to elevate or retract the filter.
* (53) Screw Bracket: Connective support that transmits vertical motion to the filter housing; designed with minimal obstruction to airflow.
* (54) Lower Fastener Receptacles: Mechanical anchor points for securing the lower display module.
* (60) Display Module: A compact embedded display that provides real-time status indicators such as filter position, motor operation, and system diagnostics.
* (61) Display PCB: Hosts the control circuitry and status LEDs for the display unit.
* (62) Mounting Tabs: Threaded fixtures that fasten the display module (60) to the filter housing via the receptacles (54).  
This integrated mechanical-electronic architecture ensures high durability and operational redundancy. By separating the heavy fan assembly from the movable filter unit, motor load is minimized, enabling the use of a compact lifting actuator. The use of linear guidance (10a, 50a) and embedded control (43, 61) supports robust, vibration-resistant operation suitable for deployment in high-reliability building safety systems.