See how a mobile drain sealing device uses a reversibly expandable flexible unit and support st
See how foam and rubber insulation positioned along the frame perimeter prevents air leakage th
See how gravity-activated rotatable panels in ventilation shafts prevent underground flooding w
See how rotatable closure panels with self-actuating drains prevent storm surge flooding in und
Breakaway connectors let a flood vent panel stay closed to block animals, then release under flood pressure to clear debris and equalize hydrostatic forces.
Perimeter insulation and a sealed vent door block air leakage while still allowing floodwater flow to equalize hydrostatic pressure.
Segmented rigid plates, a flexible membrane, and levered gasket compression seal irregular grated openings against flood pressure and wind.
Foam insulation and dual-frame vent doors block air leakage while preserving floodwater equalization through the structure.