Air flow control for a building, to create an overpressure in escape routes to prevent the entry of fire smoke, has a flap at the air opening moved by a setting drive together with an upstream closure flap

摘要

The air flow control for installation in the air flow opening (2) of an air pressure system in a building, to generate an overpressure in escape paths to prevent the entry of smoke from a fire, has a moving flap (3) held in the closed position by a spring. A setting drive (4) moves the flap into the open position against the spring pressure. A closure flap (8), upstream of it, can be opened and closed, where its free side can lie against the wall surface (1) of the air flow opening.