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904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 4" 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
Heavy Duty ConstructionMRI CompatibleInsect Screen
Low profile design for tight mechanical areas
Steel Blade Grille - Vertical Fixed Blade 937-20X20 Commercial 904 - Double Deflection AdjustableStandard Features *Surface mount return air grille * 0 fixed blades parallel to longest dimension * Countersunk mounting holes for flush appearance with color matching Phillips posi drive screws * Soft White Options * 937 O recessed screwdriver operated opposed blade damper * No Labor Collar (square sizes only) * 900 T T Bar mount * 905 HD reinforced construction * 905 IS insect screen * 1335 1338 Series stainless steel version * Tamper proof screws
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