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* 2650 - Round spring actuated (6) damper for vertical or horizontal mount
Perforated Face Grille
1550 Series Submittal
Opposed Blade Damper standard on 4" widths
4" 3 Hour Vertical Mount Fire Door 2661-48X36 T-Bar * 2650 - Round 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"
