Curved access doors to suit circular ductwork. Used to access the insides of the ducting to reset fire dampers or to clean. A sandwich type effect that clamps the opening with a gasket seal by wheel knobs.
Circular single blade externally resettable fire dampers for prevention of fire spreading in ventilation ductwork with a fusible thermal link that triggers at 72 degrees C. The damper has a mounting plate so it can be fitted to surfaces and act as a closing gate in between walls in buildings. Mainly manufactured from hot galvanized steel sheet.
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