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Ships within 48 hours · Estimated delivery Aug 21 - Aug 26
22 gauge butterfly style galvanized steel blades
Negator stainless steel closure springs mounted on spring pin brackets
Locking screw to hold damper in place
Insect Screen
Spiral pipe diameter must be 4” larger than Height of the duct opening
3 Hour Out Of Air Fire Door Grille 2663-36X22 Step Down Ceiling Diffuser 22 gauge butterfly style galvanizedh3. Standard Features * 2661 Square or rectangular fire door for vertical mount only. Maximum dimension 60x60. For damper free area chart A click here * 2663 Out of Airstream fire door. Square or rectangular for vertical mount only. Maximum dimension 60w x 52h. For damper free area chart B click here * 2665 Round fire door for vertical mount only. Available 4" thru 52" round. * 3 hour rated * UL and California State Fire Marshall approved * 4 1 4"
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