Abstract: A self-closing vent intended for use in attics, crawl spaces, joist cavities, exterior walls, interior walls, or other structural element which allows for the free flow of air from outside a building to interior spaces during normal use. The vent includes a damper blade pivotally connected to, and disposed within, the vent housing, which is held in an open position by a temperature sensitive fusible link. Two, and preferably three, permanent magnets provide the force for driving the damper blade into a closed and locked position. A first magnet disposed in a side of the vent housing and a second magnet disposed on the damper blade are disposed with opposing (repelling) polarities when the damper blade is held in the open position. A third magnet disposed proximate the back of the vent housing is oriented so as to attract the magnet disposed on the damper blade.

Abstract: A vent assembly for attachment to a fluid discharge conduit of the type connected to a clothes dryer, room exhaust fan, or the like is adapted to reduce or prevent the trapping of dirt or lint as well as flapping or vibration of the door in windy conditions. A mount having an opening is received on the conduit and a door is pivotally received by the mount. The door is operable for displacement with respect to the opening between an open position and a closed position when engaged by a fluid, such as air from a clothes dryer, flowing through the discharge conduit. A hood is pivotally mounted over the door and mount opening, and is operable for displacement with respect to the mount when engaged by the door and/or by fluid flowing through the discharge conduit.

Abstract: A fire stop apparatus for a small duct, high velocity air distribution system is assembled to a duct opening and includes a cylindrical support wall that supports a cylindrical band of intumescent material that expands and closes the duct opening when subjected to the heat of a fire.

Abstract: The present invention relates to a blower for a vehicle, which has an auxiliary door formed on the upper end portion of a filter cover to open and close an indoor air inlet, thereby improving a heating performance by allowing some of the indoor air to flow therein in an outdoor air inflow mode regardless of a type of an indoor and outdoor air switching door, improving productivity and reducing manufacturing costs.