Shielded vent port
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United States of America Patent
Stats
-
Mar 24, 1981
Grant Date -
N/A
app pub date -
Oct 26, 1978
filing date -
Oct 26, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A shielded vent port for equilization of the pressure on opposed faces of a wall comprises a frame for fitting into an opening in said wall, a conduit through said frame, a sloping plate in said conduit, said plate being sealed against the walls of said conduit and having a large aperture therethrough, and a riser lying against the upper face of said sloping plate, said riser preventing flow of air in a downward direction through said plate and being movable away from said plate to permit flow therethrough in an upward direction. To provide for flow of air through said wall in either direction, the frame may have two conduits therethrough with a sloping plate and a fitted riser in each, the planes of said plates sloping in opposed directions. The shield may be lifted away from the plate to permit flow of air therethrough by an excess of pressure below the plate or by a solenoid in response to an external signal.
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