The Zero International 355A drop seal is an automatic threshold seal morticed into the bottom of fire-rated doors to prevent the spread of fire and smoke. Activated upon closing, it forms a seal without impeding door operation.
Designed to be morticed (rebated) into the bottom edge of steel doors, keeping them hidden when the door is open
Seal automatically drops when the door closes, sealing gaps beneath doors up to 12.7mm.
Suitable for double doors
Stocked lengths: 305mm to 1524mm in 152mm increments. Can be cut down from the non-operating end by up to 152mm to fit exact door widths (cut allowance is smaller for sizes under 762mm)
Ideal for residential and commercial settings, and high-traffic public areas such as schools, hospitals and hotels.
Fire tested to BS EN 1634-1 on steel doors to achieve a 180-minute fire rating
Successfully tested to BS EN 1634-3 smoke rating for cold smoke seals on steel doors
Tested for high-cycle usage up to 5,000,000 cycles.
