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Zinc plated steel closure spring
Field installable bowtie damper with round ring
Long throw individually adjustable blades with 1 1/2" blades on 1 1/2" centers or 3" blades on 3" centers
Standard Features * Designed for return or exhaust applications * 3/16" holes on 1/4" staggered centers * Heavy gauge steel * Seismic support holes * 1x2
4" 3 Hour Vertical Mount Fire Door 2661-10X10 Smoke-Fire Damper Zinc plated steel closure springh3. 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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