A vent cover assembly to cover an opening in a crawl space vent includes a vent cover having upper and lower surfaces, an outer perimeter and a planar clip. The vent cover includes a slit positioned through the upper and lower surfaces of the vent cover to receive the clip. The clip has a ring portion and a first leg and a second leg extending therefrom. The first and second legs are configured to be slidably inserted through the slit of the vent cover. The first and second legs of the clip are positioned and configured to receive therebetween a portion of a vertically positioned central wall of the crawl space vent. The central wall is frictionally griped between the first and second legs of the clip, and the inner surface of the vent cover is simultaneously positioned over an outer perimeter of the vent to close the vent.

A ventilation system includes an inside air passage having inflow and outflow ends communicating with an indoor space to be ventilated, at least one permeable film unit including a permeable film, and an air supply passage having an inflow end communicating with an outdoor space and an outflow end connected to a downstream side of the permeable film in the inside air passage. The permeable film allows a target gas to pass and allows the target gas that has passed through the permeable film to be discharged into outdoor air. The target gas contains at least one of carbon dioxide and a volatile organic compound in indoor air that flows in the inside air passage. Alternatively or in addition, the ventilation system can include an outside air passage and a discharge passage in place of or in addition to the inside air passage and the air supply passage, respectively.

A vent apparatus comprises a mount with air flow opening for mounting to a wall, a housing covering the mount, and a door pivoted to fall by gravity to a closed position but being movable to an open position when air flows from the air outflow passageway. The housing forms a downwardly and outwardly open chute extending well below a bottom of the mount and door, thus discouraging birds from approaching the air flow opening. The door and mount include bottom flanges that overlap when the door is in the closed position, further discouraging bird entry. The mount, housing and door are all metal with stiffening bends that are relatively simple construction, making assembly tow cost and providing a reliable function. The housing does not include large horizontal surfaces, thus discouraging birds and animals from building a nest in or on the housing.

A ventilation device for ventilating rooms, has a first air routing device for routing a first flow of air, the routing device having a first room-side outlet, a first flow space in which at least one first fan capable of bidirectional operation is arranged, and a first outside outlet; a second air routing device for routing a second flow of air, which is fluidically completely separate from the first air routing device and has a second room-side outlet, a second flow space in which at least one second fan capable of bidirectional operation is arranged, and a second outside outlet; an integral gas-solid heat exchanger adapted to route the first flow of air and the second flow of air in a respective set of passageways, in a fluidically separated but thermally coupled manner, wherein the solid in the first and the second air routing device additionally forms a respective regenerator.

An exemplary vent for a heat recovery ventilator is provided. The vent includes an exhaust opening and an intake opening positioned below the exhaust opening. The exhaust opening and the intake opening are configured to be coupled to an air exhaust duct and an air intake duct, respectively, of the heat recovery ventilator. A hood is positioned around the exhaust opening, the hood including a top plate, a first side plate coupled to the top plate, a second side plate coupled to the top plate, and a bottom plate coupled to the first and second side plates. Each of the top plate and the bottom plate is configured to slope downward from the exhaust opening.

To provide a structure that can improve air permeability from a first space to a second space and can prevent a building structure from increasing in size. A wall 11 has: a body section 35 separating an outside A1 from a living space B1 of a building; a ventilation device 30 provided in the body section 35; and a first ventilation channel 24 and a second ventilation channel 25 provided in the ventilation device 30, the first ventilation channel 24 and the second ventilation channel 25 sending air in the outside A1 to the living space B1, wherein arrangement ranges L1 and L2 of the ventilation device 30 in a thickness direction of the body section 35 are within an arrangement range L3 of the body section 35, and a cross-sectional area of the first ventilation channel 24 in a plane perpendicular to a virtual line E1 indicating a center of the second ventilation channel 24 narrows as it approaches the living space B1 along the virtual line E1.

A switched-mode light-emitting diode (LED) display unit satisfying fire-fighting smoke exhaust and ventilation requirements includes an LED display unit, a mounting member, an opening-closing actuator and a pressing member. The LED display unit is mounted on the mounting member and the mounting member is mounted on a display panel by an opening-closing actuator and pressed against the display panel by a pressing member. The switched-mode LED display unit provides the pressing member that works to release the pressed mounting member after obtaining a triggering command and the opening-closing actuator that turns on the LED display unit subsequently, thereby meeting the fire smoke exhaust ventilation requirement of the internal surface or the external surface of a building.

A pre-formed covering for moisture-proofing and insulating a wall box (also called a vent box and exhaust box) and method of moisture-proofing and insulating a wall box using the pre-formed covering. The pre-formed covering is made of an air impermeable and insulating material, and is configured, shaped and dimensioned to fit over at least a portion of the wall box and be sealable to the wall box to minimize leakage of air and/or moisture from the wall box.

A wall exhaust vent (e.g., for a dryer or other HVAC system) can include a housing defining a vent opening, and one or more bumpers on or at least partially within the housing and configured contact a door of the wall exhaust vent in a closed position. The one or more bumpers can include a bumper body, and a magnet disposed at least partially within the bumper body that is configured to magnetically interact with the door of the wall exhaust vent to bias the door to the closed position.

An enclosure vent is operable to be mounted to a building that presents an interior space and to move in response to a change in vent temperature. The vent includes a vent frame and a laminated composite vent panel. The vent panel includes outer and inner panel layers and an intermediate connecting structure that connects the panel layers relative to one another along an interface defined between the panel layers. The outer and inner panel layers have, respectively, first and second coefficients of thermal expansion that are different from each other and cause expansion and contraction of the corresponding panel layers along the interface. The connecting structure permits expansion and/or contraction of each panel layer in response to a vent temperature change so that the panel flexes.