4" 3 Hour Vertical Mount Fire Door 2661-12X10 T-Bar Note: Sizes are Listed Nominal

Note: Sizes are Listed Nominal Duct Opening

Square or rectangular ceiling radiation butterfly damper

*Note: Ceramic fiber blade insulation is not UL required on dampers with free areas less than 80 square inches

Countersunk mounting holes for flush appearance with color matching Phillips Pozidriv screws

4" 3 Hour Vertical Mount Fire Door 2661-12X10 T-Bar Note: Sizes are Listed Nominalh3. 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"