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904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 12" Duct Opening (front blades parallel to shortest dimension)
One piece curved frame with gasket fits flush to spiral pipe
Nylon bushings on adjustable blades prevent metal on metal rattle
MRI Compatible
listed Fire-Resistance Diffuser * TVB - Thermal Vapor Blanket * Square Collar
Steel Blade Grille - Vertical Fixed Blade 937-18X8 Step Down Ceiling Diffuser 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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