1540-520 Insulated Flood Vent, 16 in W, 8 in H, 200 sq-ft Net Free Ventilating Area, Stainless Steel

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. The flood door contains a 2 in insulated core that has an R-value of 8.34. There is also a felt weather stripping that lines the entire vent frame helping to keep the enclosure as insulated as possible.