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1/2" spacing dual angular louvers for strength and maximum free area
904 - Double Deflection Adjustable Aluminum Blade Grille For a 18" x 4" Duct Opening (front blades parallel to shortest dimension)
Spiral Diffuser Radius Flush Mount Diffuser Single Deflec
Standard Features *Surface mount return air grille * 45 fixed blades parallel to longest dimension * Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Soft White Options * 935 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
Adjustable Curved Blade Diffuser SCB-6X6 Damper:Multi-Shutter Damper 1/2" spacing dual angular louversStandard Features * Individually adjustable steel curved blades * Lever operated steel multi shutter damper * Pivoted steel blades for easy firm positioning * All component parts, rivets, linkage and handle enclosed in valve to assure trouble free operation * Countersunk mounting holes for flush appearance with color matching Phillips posi drive screws * Soft White Options * SCB41 4 way air pattern * SCB31 3 way air pattern * SCB41 O or SCB31 O steel
