1540-510 Flood and Ventilation Vent, 16 in W, 8 in H, 51 sq-ft Net Free Ventilating Area, Stainless Steel

A bimetal coil automatically opens and closes the ventilation louvers as temperature changes. No electricity is required. The louvers will be fully closed at 35 deg F and fully open at 75 deg F. In the event of a flood the internal floats lift to release the flood door to rotate open and relieve the hydrostatic pressure regardless of the louver's position, open or closed. The vent door is latched closed until it comes in contact with flood water. Entering flood water lifts the patented internal floats which unlatch and allow the door to rotate open. This allows the flood water to automatically enter and exit through the frame opening, relieving the pressure from the foundation walls. Certified flood debris clearance is demonstrated with a 3 in Dia opening when the flood door is activated.