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Countersunk mounting holes for flush appearance with color matching Phillips posi- drive screws
904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 20" Duct Opening (front blades parallel to shortest dimension)
Opposed Blade Damper standard on 4" widths
Spiral Diffuser Radius Flush Mount Diffuser Single Deflection with Damper
Curved saddle with gasket provides airtight fit to spiral pipe
Volume Damper Low-Leak OBD 3000-0BDLL-52X20 Residential Registers & Grilles Countersunk mounting holes for flushh3. Standard Features * Opposed blade operation for precise volume control * 16 gauge galvanized channel frame * Blades are vee stiffened 16 gauge galvanized for strength and stability * Blades pivot on non metallic celcon bushings * 1 2" square zinc plated steel pivot pins * 1 2" square zinc plated steel adjustable operating shaft extending up to 4" beyond the air control frame * Single blades on dampers with a height of 12" or less * Mill finish h3.
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