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Ships within 48 hours · Estimated delivery Aug 9 - Aug 14
Standard Features *
Spiral pipe diameter must be 4” larger than Height of the duct opening
3/16” holes on 1/4” staggered centers
Interlocking steel roll-formed blades
4" 3 Hour Vertical Mount Fire Door 2661-48X44 Step Down Ceiling Diffuser Standard Features *h3. 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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