When the fire door encounters a fire, the flame retardant rubber strip expands to completely seal the door seam to prevent smoke from entering. The flame retardant time can reach more than 2h, extending the rescue time.

https://ztfiredoor.com/21430.html

fire rated honeycomb door glue,fire rated hotel room doors,fireproof fire rated external door,fire rated mortise door lock,fire rated french doors,fire rated automatic sliding doors,fire rated honeycomb door glue,fire rating entry door,fire rated french doors,doors fire rated,fireproof fire rated external door,fire rated elevator doors,fire rated honeycomb door glue,fire smoke proof doors,fire rated french doors,fireproof fire rated external door