A door unit for an air conditioning system includes a stationary inner screen part, an outer casing part rotatable between different operational positions in relation to the inner screen part, and a flap member attached to the outer casing part. The outer casing part includes first and second inlet openings. The door unit directs a first flow of air in a first air flow channel and a second flow of air in a second air flow channel to a third air flow channel or to the third air flow channel and a fourth air flow channel. The flap member blocks the first air flow channel or the second air flow channel, wherein an internal volume of the door unit enclosed by the inner screen part and the outer casing part forms the fourth air flow channel.

The present invention relates to a flexible air duct winding and unwinding device for air supply, including an air duct reel assembly, a flexible air duct, two reel seats, a rotating air inlet assembly and a rotating drive assembly for driving the rotation of the air duct reel assembly; the air duct reel assembly includes a reel body, a reel air duct shaft, and a reel rotating shaft, the rotating air inlet assembly includes an inlet air duct, a fixed air duct and a rotating air duct rotatably inserted in the fixed air duct, the air outlet end of the inlet air duct is connected with the air inlet end of the fixed air duct, the air outlet end of the rotating air duct is fixedly connected with the reel air duct shaft, and the output shaft of the rotating drive assembly is fixedly connected with the reel rotating shaft.

Disclosed is a system and method for power line control of electrical fans. The system generates a sinusoidal wave using a crystal oscillator. Control information is added to the sinusoidal wave by routing the wave through a phase inversion circuit a predetermined intervals according to a protocol. The resulting control signal is sent on a power line. The control signal is received using a crystal filter, decoded and converted to executable instructions for controlling a fan motor.

An air conditioning system using a fuel cell system can reduce energy consumption for air conditioning and can use the electricity produced by operating the fuel cells, where a fuel cell blower that is used to operate fuel cells is also used for air conditioning. The air conditioning system includes an air intake line connected between an interior and an exterior of a building; an air blower disposed in the air intake line to supply external air to the interior; a first intake shut-off valve for opening or closing the air intake line; a fuel cell system receiving air in the interior by operation of the fuel cell blower and producing electrical energy; and a controller controlling operation of the first intake shut-off valve to open the air intake line when the fuel cell system is operated.

A system for delivering power and data over a single wire via a hub, wherein the hub can control and power multiple low-power Class 2 circuits. The hub can be controlled remotely through a computing device such as a mobile phone or a computer.

This application relates to ventilation systems, more particularly to roof ventilation systems that help to protect buildings against fires. The roof vent has an ember impedance structure that impedes the entry of flames and embers or other floating burning materials while still permitting sufficient air flow to adequately ventilate a building. Several configurations of vents employing baffle members and fire-resistant mesh material are described, which can substantially prevent the ingress of floating embers and flames.

An exhaust and filtration assembly includes: a housing; an exhaust vent configured to guide unfiltered air out of the exhaust and filtration assembly; a filter assembly configured to filter air and guide the filtered air out of the exhaust and filtration assembly; an exhaust assembly configured to direct raw air from an entry port of the exhaust and filtration assembly and direct air out of the exhaust vent without the air having been filtered; and a controller comprising computing logic configured to control so that only one of air filtration and raw air exhaust occurs at any given time.

Washing machine appliance ventilation systems and methods include rotating a wash basket of the washing machine appliance for an ON period, whereby a flow of ambient air is drawn through an aperture in the washing machine appliance from an ambient environment into the wash basket. The systems and methods also include comparing a humidity within the washing machine appliance to a reference humidity value. When a difference between the humidity within the washing machine appliance and the reference humidity value is greater than a threshold, the step of rotating the wash basket for the ON period is repeated. When the difference between the humidity within the washing machine appliance and the reference humidity value is less than or equal to the threshold, the ventilation cycle or method is terminated.

A single-package air conditioner unit may include a housing, an outdoor heat exchanger assembly, an indoor heat exchanger assembly, a compressor, and a plenum. The housing may define an outdoor portion and an indoor portion. The plenum may be attached to the housing and receivable within a wall channel defined by a structure wall. The plenum may define a primary air channel and a make-up air (MUA) inlet in fluid parallel with the primary air channel. The primary air channel may be disposed in fluid communication with the outdoor portion to permit air therebetween. The MUA inlet may be in fluid communication with the indoor portion to permit air thereto.

An indoor pollution prevention system includes a plurality of gas detection modules, one or more intelligent control-driving processing devices, one or more gas-exchange processing devices, one or more intake passages, and one or more discharge passages. The intake passage is connected to the gas-exchange processing device and has an intake opening for guiding the outdoor gas into an indoor space. The discharge passage is connected to the gas-exchange processing device and has a discharge opening for discharging the air pollution source to the outdoor space. The intelligent control-driving processing device controls the gas-exchange processing device to be enabled under a surveillance condition of the gas detection module, so that the air pollution source passes through the discharge passage, filtered and purified by a cleaning and filtration assembly, and is discharged to the outdoor space, thereby allowing the indoor space to have a clean air.