PRESSURE RELIEF VENT MAINTAINING FIRE RATING INTEGRITY

摘要

The invention consists of a metal box frame into which a series of hinged louvers are fitted. These louvers consist of a metal wing section with a- leading edge with an up stand or slot and a formed tab on the trailing edge that has the effect of an aileron. They are hinged on a pivot point that is offset from a point drawn from the leading edge to the trailing edge. This offset has the effect of using the weight of the louvers as a bias about the pivot point effectively holding the louvers closed and the overlap or interlinked portion together until a minimum air pressure is reached. The effective aileron on the trailing edge of each blade serves two purposes, one is to fit into a slot or up stand on the leading edge of the next blade for the purposes of protection from fire penetration and the other is to provide a mechanically advantageous position, that being the furthest point from the pivot, to best use the force of the passing air being relieved to efficiently open the vent at low pressures.