3 Hour Out Of Air Fire Door Grille 2663-48X20 T-Bar 904 - Double Deflection Adjustable

904 - Double Deflection Adjustable Aluminum Blade Grille For a 48" x 24" Duct Opening (front blades parallel to shortest dimension)

904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 20" Duct Opening (front blades parallel to shortest dimension)

Steel multi-shutter damper

12" and 14") * HVD OR - factory installed opposed radial damper (sizes 6"-14") * HVD FR - U

" Spiral pipe diameter must be 4” larger than width of grille

3 Hour Out Of Air Fire Door Grille 2663-48X20 T-Bar 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"