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Ceramic Fiber Gasket
(2300° F max - meets NFPA 96 standards) is permanently bonded to front (top) plate of access door to eliminate leakage. Conical Springs are installed over the bolts, between the inner and outer door to facilitate opening. Hi-Temperature Access Door application approval resides with authority having jurisdiction.
Duct opening cut-out Template is provided for exact size of Duct opening required.Inside Door
The two layers of metal are spotwelded together at the rim. Inside surface of Access Door is smooth, to reduce friction.
Zinc coated wing nuts are easily turned by hand, no wrenches required.