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904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 24" Duct Opening (front blades parallel to shortest dimension)
Hand operated lever for easy filter access and cleaning
Recommended Minimum Sleeve Thickness for Fire Dampers
Extruded aluminum frame with steel roll formed blades and steel multi-shutter damper
3 Hour Out Of Air Fire Door Grille 2663-30X14 Residential Registers & Grilles 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"
