4" 3 Hour Vertical Mount Fire Door 2665-22 past 12 months 904 - Double Deflection Adjustable

904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 16" duct Opening  (front blades parallel to shortest dimension)

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

Round ceiling radiation butterfly damper

Available in 4" through 24" round

PERFORMANCE DATA FGAD Series Engineering/Performance Data

4" 3 Hour Vertical Mount Fire Door 2665-22 past 12 months 904 - Double Deflection Adjustableh3. 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"