The Flood Vent Sealing Kit works to create a tight, insulated seal behind the vent opening. Model 1540-526-4 is designed for the Insulated Multi-Frame Model 1540-150202E (1540-0239) When a flood event occurs, the precision-cut, engineered material is dislodged, creating an unobstructed opening. This sealing kit works in conjunction with our 1540-520 Insulated Smart Vent and is certified to meet the stringent 2018 Energy codes.