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Ships within 48 hours · Estimated delivery Aug 13 - Aug 18
cross bars
1-27/32” x 11/32” slots
1 1/2 hour fire resistance rating
remove the two center cones as a unit and reposition the six screws
904 - Double Deflection Adjustable Aluminum Blade Grille For a 30" x 10" Duct Opening (front blades parallel to shortest dimension)
Opposed Blade Volume Damper 3000-0BD-40X30 Residential Registers & Grilles cross barsh3. 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.
