Smart Vent Dual Function, Engineered Foundation Flood Vent, Model 1540-510
Straightforward retrofit or new-construction install into a standard foundation vent opening. This vent does two jobs in one unit. First, it’s a certified flood vent: the door stays latched shut until rising water lifts internal floats inside the housing, which releases the door and lets it swing open so water can pass through the foundation wall instead of building up pressure against it.