An exhaust hood system can include an intake located within a building, an output, a duct positioned between the intake and the output, the duct fluidly connecting the intake and the output together, a filter positioned within the duct, the filter emitting a liquid within a portion of the duct, a drain in fluid communication with the filter, and a chamber comprising a photosynthetic agent or a fungal agent. The chamber can be in fluid communication with the drain.

A damper assembly having a main body defining a continuous fluid path extending between a first opening and a second opening and a damper door rotatable within the main body to control the flow of fluid through the main body. The main body including an engagement edge extending circumferentially on an inner surface of the main body. The damper door can be rotated relative to the main body to sealingly engage an outer edge of the damper door with the engagement edge. The engagement edge of the main body can be oriented on the inner surface such that the surface area of the outer edge such that engagement of the engagement edge gradually increases as the damper door is rotated to seal the damper door to the main body.

Air conditioning system and a method for controlling same. The air conditioning system is configured to carry out air conditioning in indoor space, and includes an indoor unit body. The indoor unit body includes a cavity and a heat exchanger arranged inside the cavity. The air conditioning system further includes at least one return air inlet connecting the indoor space to the cavity. The at least one return air inlet includes a first return air inlet, and the first return air inlet is located at a lower portion of the indoor space.

The indoor ventilation exhaust system is configured for use in a domestic space. The indoor ventilation exhaust system is configured for use with second-hand smoke. The indoor ventilation exhaust system draws atmospheric gases containing second-hand smoke out of a domestic space. The indoor ventilation exhaust system comprises an manifold, discharge system, and a collection network. The discharge system attaches to the manifold. Each of one or more collection networks attach to the manifolds. The discharge system creates a partial vacuum that draws the second-hand smoke of out the domestic space into the collection network. The second-hand smoke is aggregated in the manifold and is then discharged from the domestic structure containing the domestic space through the discharge system. The discharge system creates the partial vacuum that transports the second-hand smoke.

A more simple and convenient assembly and disassembly ventilation device is disclosed, comprising a housing having an receiving space therein, both sides of which are provided with an air inlet and an air outlet communicating with the receiving space; a plurality of positioning member disposed on the inner wall of the top of the housing; a fan module detachably disposed in the receiving space of the housing and fastened to the positioning member; and a power control device disposed in the receiving space with its shell connected to the inner wall corresponding to the housing in a detachable manner. The power control device is electrically connected with the fan module, and has a wire-arranging element for fixing the electric wires of the fan module.

An exhaust hood system can include an intake located within a building, an output, a duct positioned between the intake and the output, the duct fluidly connecting the intake and the output together, a filter positioned within the duct, the filter emitting a liquid within a portion of the duct, a drain in fluid communication with the filter, and a chamber comprising a photosynthetic agent or a fungal agent. The chamber can be in fluid communication with the drain.

A soffit vent for dispersing moist air. The soffit vent can receive moisture through an interface unit which is connected to an elbow unit. The elbow unit is constructed to guide the moisture into an extension unit. The extension unit then leads the moisture to an outdoor area through an end unit. A flap unit is disposed between the extension unit and the end unit to prevent a backdraft of moisture. The end unit has a plurality of fixed baffles that are oriented upwardly to direct moisture upward and away from a building.

A soffit vent for dispersing moist air. The soffit vent can receive moisture through an interface unit which is connected to an elbow unit. The elbow unit is constructed to guide the moisture into an extension unit. The extension unit then leads the moisture to an outdoor area through an end unit. A flap unit is disposed between the extension unit and the end unit to prevent a backdraft of moisture. The end unit has a plurality of fixed baffles that are oriented upwardly to direct moisture upward and away from a building.

An insulated HVAC duct component such as a transition box includes a first insulation layer and a second, different insulation layer. The transition box includes at least four sidewalls and one of a top and a back wall, the transition box further including a first access port and a second access port, the first access port having a different cross section than the second access port, one of the access ports being spaced from a nearest sidewall by less than 2 inches. The first insulation layer is located along an inside surface of the box. The second different insulation layer overlies the first insulation layer, the second different insulation layer having an air impervious surface, wherein the combined thickness of the first insulation layer and the second different insulation layer is less than 2 inches.

A system for optimizing one or more environmental parameters of an enclosed space comprising first and second relatively enclosed regions, such as a living space and a roof space within a building, is disclosed. The system comprises an internal sensor, in the first region, and an external sensor, external to the enclosed space, for measuring respective environmental parameters. The system also comprises a controller and a diverter valve. The controller is configured to specify the first region's ideal internal environmental parameter, and compare this specified parameter with the measured first region's internal parameter and the measured external parameter to determine whether the diverter valve directs air from the first or second enclosed region to exhaust through the ventilator.