| 摘要 |
A fire responsive, closing air vent includes a main frame enclosing an air flow passageway with a hingeable cover connected to the main frame which can open and close. The frame has a mechanism for biasing the cover towards the closed position and a preformed mass of material, e.g. meltable wax positioned at least in part between the frame and the cover to hold the cover in the open position. The material is at least partially moveable (e.g., shrinkable or meltable) in response to an increase in ambient temperature in excess of 140 DEG F. so as to cease from holding the cover in an open position and permitting the weight to close the cover. In one embodiment, the vent is made up of a flat plate and a subframe for insertion into a building structure and is positioned at right angles to the flat plate. In another embodiment, the main frame of the closing air vent has a plurality of air passageways and the cover is capable of covering all of the air passageways.
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