The goal of this phase of the research project was to determine, through experimental full-scale testing, the effect and influences clearance gap dimensions under swinging fire doors have on the performance of the assemblies to prevent a fire from spreading. The project focused on conducting 13 full-scale experimental tests—a total of 17 door.. How to fix fire door gaps. Surface mounted drop-down smoke seals or rebated drop-down smoke seals can be fitted to existing fire doors if the gap is too large. Usually suitable for gaps of up to 14mm, they can be attached to the bottom of the door. When the door closes, a plunger makes contact with the door frame and lowers the seal to the.

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Simpler, Smarter and Safer. NGP's UL Certified 90-Minute Fire Door Gap Solutions will help you avoid the cost, labor and disruption of replacing existing str.. The manufacturer verifies this for each door type by testing the complete fire door and frame. Frame to door gaps in a fire door need to be consistently 3-4mm. There should be no more than a 10mm gap at the bottom of the door. If the fire door must be smoke resistant as well, the gap at the bottom of the door should only be 3mm.