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904 - Double Deflection Adjustable Aluminum Blade Grille For a 30" x 12" Duct Opening (front blades parallel to shortest dimension)
14 gauge steel construction
Adjustable steel roll formed blades oriented for 1 or 2 way airflow pattern
Holds up to a 4" filter (not included) with filter retention tabs (FG4)
Airfoil blades individually adjustable on 3/4" centers
2" 3 Hour Vertical Mount Fire Door 2561-36X30 past 12 months 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 *
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