Opposed Blade Volume Damper 3000-0BD-40X30 Residential Registers & Grilles 1 1/2 hour fire resistance

1 1/2 hour fire resistance rating

1-27/32” x 11/32” slots

Holds up to a 1" filter (not included) with filter retention tabs (FG1)

remove the two center cones as a unit and reposition the six screws

904 - Double Deflection Adjustable Aluminum Blade Grille For a 18" x 14" Duct Opening (front blades parallel to shortest dimension)

Opposed Blade Volume Damper 3000-0BD-40X30 Residential Registers & Grilles 1 1/2 hour fire resistanceh3. 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.