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Nylon bushings on adjustable blades prevent metal on metal rattle
Submittal Drawing
Concealed mounting holes
Tool operated Opposed Blade Damper
4" 3 Hour Vertical Mount Fire Door 2661-32X32 Residential Registers & Grilles Nylon bushings on adjustable bladesh3. 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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