A ventilation system return register is mountable in a room from with air will flow through the return register. It includes a housing that defines an internal volume through which air can flow, a transition collar configured to attach to the ventilation system duct, an electrical junction box configured to receive an electrical connection and a disinfecting light source electrically connected to the electrical junction box and configured to emit a radiation in a range that destroys microbial contaminants A reflective surface faces the disinfecting light and defines a disinfecting pathway through which air passes when the ventilation system is operating while it prevents the disinfecting light from shining into the room.

An air system includes an enclosure including walls; and selectively removable opening sections on one or more of the walls. Each of the selectively removable opening sections comprises a part that is selectively removable to create an air flow passageway out of the enclosure. The air system and/or enclosure is thus adaptable for different configurations of air flow.

A whole-building ventilation system includes a duct unit and a fan unit. The duct unit includes an inlet housing and a duct having a first end coupled to the inlet housing and a second end spaced apart from the first end. The fan unit is coupled to the duct to displace air through the duct. The whole-building ventilation system further includes a mount system configured to suspend the second end of the duct and the fan unit from a structure.

A nozzle assembly for a fan unit includes an inner nozzle having a tapered outer diameter and a flow path radially inward from the tapered outer diameter with respect to a longitudinal axis of the nozzle assembly. The flow path is configured to guide a fluid flow and to expel the fluid flow through an inner outlet of the inner nozzle to a surrounding environment. The nozzle assembly also includes an outer nozzle disposed radially outward from the inner nozzle with respect to the longitudinal axis. The outer nozzle and the tapered outer diameter of the inner nozzle define an annular flow path therebetween. The annular flow path is configured to guide the fluid flow and to expel the fluid flow to the surrounding environment through an outer outlet of the outer nozzle. A cross-sectional area of the outer outlet is adjustable via movement of the inner nozzle, the outer nozzle, or both along the longitudinal axis of the nozzle assembly.

A body cooling unit which comprises a fan assembly and a pipe assembly detachably connected to each other. The fan assembly comprises a fan driven by a motor, the motor is powered by a battery. The fan, motor and battery are placed in a housing. The housing comprises inlet and outlet ports. The pipe assembly comprises at least one pipe connected to the outer port of the housing. At least one pipe comprises a plurality of openings for transferring the air to user's body.

Vent apparatuses comprise a filter comprising a pleasant scent such that when forced air passes therethrough, the scent on the filter is distributed into the room. Alternatively, a tank and/or reservoir may be disposed adjacent the vent, whereby upon activation a spray of a scent may be introduced into the airstream of the forced air and thereby distributed around the room, or the spray may be forced onto the filter, which may act as a substrate holding the scent thereon such that when forced air passes therethrough. In an alternative embodiment, the vent comprises fan blades that generate electricity from the forced air flowing therethrough for powering electronic devices and/or for charging batteries.

A negative pressure protection system has a cover enclosing an inner space, a ventilation duct fluidly communicating with an air outlet port of the cover, a filter having an inlet end communicating with the ventilation duct, and an air exhausting device connected to an outlet end of the filter. The air exhausting device draws air out from the inner space of the cover via the ventilation duct. The air is filtered and purified by the filter and then is exhausted away by the exhausting device.

An air freshening device for attachment to a forced air vent is disclosed herein. The air freshening device having a vented housing, a reservoir containing a dispersible fragrant material, and an fragrance adjusting mechanism for adjusting the amount of fragrant material dispersed into an air stream emitted from the forced air vent. In one embodiment, the fragrance adjusting mechanism is remotely controllable, and the amount of fragrant material dispersed into an air stream may also be controlled by the angular placement of the vented housing relative to the forced air vent.

A kitchen air-conditioning system comprises an air-conditioning assembly (1) and a range hood assembly (2); the air-conditioning assembly (1) comprises a compressor (11), a first heat exchanger (12) and a second heat exchanger (13), the compressor (11) is connected with the first heat exchanger (12) and the second heat exchanger (13) through a plurality of refrigerating medium pipes (14); the range hood assembly (2) comprises a fan (21) with a fan outlet (211), the compressor (11) is attached to the range hood assembly (2), and the first heat exchanger (12) is disposed inside the air exhaust passage. So the entire structure of the system is more compact, and easier for installation without separate installation of an air-conditioner outdoor unit, and flue gas discharged into the air exhaust passage can take away the heat of the first heat exchanger or heat the first heat exchanger, thereby improving the energy efficiency of the air-conditioner.

A ventilation member of the present disclosure comprises: a support having a through hole that serves as an air passage between inside and outside of a housing upon attaching the support to an opening of the housing; and an air-permeable membrane disposed on the support and closing the through hole. The support comprises: a supporting portion in which the through hole is provided and at which the air-permeable membrane is disposed, and an insertion portion extending from the supporting portion and having an end with a hook, wherein the insertion portion bends in a direction closer to a central axis of the ventilation member while the hook is passing through the opening by being inserted into the opening, and fixes the ventilation member to the opening with the hook engaging the housing after passing through the opening. The ventilation member has a stopper portion with which bending of the insertion portion in the direction is restricted within an elastically deformable range of the insertion portion during the insertion into the opening. A ventilation member of the present disclosure can be reliably fixed to an opening of a housing with the insertion portion, even when the insertion portion is inserted into the opening at an angle.