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When installing pairs of fire doors care must be taken to maintain the requirements of NFPA 80.
Category J gaskets for use with listed steel frames and/or classified steel covered composite, hollow metal doors rated up to and including 3 hours; wood and plastic covered composite doors rated up to and including 1-1/2 hours; and wood core doors rated for 20 minutes.
Astragal and meeting stile seals are used to seal the gap between a pair of doors. Split Astragal seals are installed on the face of both doors. When ordering Split Astragal seals, two seals must be ordered.