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Ships within 48 hours · Estimated delivery Oct 10 - Oct 15
Maximum dimension 60x60
Concealed mounting holes with mounting screws
Hand operated level for easy filter access and cleaning
53% free area * 1306: 3/4" lattice opening
Check out the All About Spirals page
4" 3 Hour Vertical Mount Fire Door 2665-5 Step Down Ceiling Diffuser Maximum dimension 60x60h3. 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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