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904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 4" Duct Opening (front blades parallel to shortest dimension)
Countersunk mounting holes for flush appearance with stainless sheet metal screws
Double deflection transition box mount spiral pipe grille
Square to round 2" collar with roll formed retention bead
3 Hour Out Of Air Fire Door Grille 2563-28X28 Residential Registers & Grilles 904 - Double Deflection Adjustableh3. Standard Features * 2561 Square or rectangular fire door for vertical mount only. Maximum dimension 48w, 49h. For damper free area chart A click here * 2563 Out of Airstream fire door. Square or rectangular for vertical mount only. Maximum dimension 48w, 41h. For damper free area chart B click here * 2565 Round fire door for vertical mount only. Available 4" thru 40" round. * UL and California State Fire Marshall approved * 2" thinline frame *
