Smart Vent 8 In. x 16 In. Dual Function Automatic Foundation Vent

A bimetal coil automatically opens and closes the ventilation louvers as temperature changes 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 louvers' position Certified flood debris clearance is demonstrated with a 3' diameter opening when the flood door is activated Used for a home with a crawlspace or any enclosed area that desires natural air ventilation and flood protection 8 In. x 16 In.