Chapter 7 of the International Building Code (IBC)1 requires life safety dampers to protect duct and air transfer openings within building separations — fire walls, fire barriers, fire partitions, ...
The backflow damper prevents the ingress of cold or warm air and wind from entering through the ventilation duct. The 4 inch Backdraft damper is made out of a Galvanized steel, the flap leaves are ...
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