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Dampers above 80 square inches free area will be provided with blade insulation
Double deflection radius mount spiral pipe grille with adjustable blades
For evaporative coolers or central blower systems
904 - Double Deflection Adjustable Aluminum Blade Grille For a 24" x 8" Duct Opening (front blades parallel to shortest dimension)
Aluminum Airfoil Blade Grille - Vertical Fixed Blade 908-16X10 Commercial Dampers above 80 square inchesStandard Features * Extruded . 055 T6 aluminum surface mount return air grille * 0 fixed blades parallel to shortest dimension * Countersunk mounting holes for flush appearance with color matching Phillips posi drive screws * Soft White Options * 908 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
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