Opposed Blade Volume Damper 3000-0BD-42X20 Residential Registers & Grilles Designed to minimize vision into

Designed to minimize vision into the air duct

accepts 6"-16" collar (collar by others)

Ceramic fiber blade insulation with fiberglass cover*

2x4 * Soft White

Opposed Blade Volume Damper 3000-0BD-42X20 Residential Registers & Grilles Designed to minimize vision intoh3. 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.