Volume Damper Low-Leak OBD 3000-0BDLL-66X12 Smoke-Fire Damper Minimum size is 4"x4"

Minimum size is 4"x4"

Standard Features * Steel honeycomb construction * Flush core and frame provides smooth surface * Free area equals more than 75% of nominal size * Driftwood Tan Options * Mounting holes for sidewall and ceiling application * 1600R - reinforced welded core and extra supports for heavy duty application * Standard Color

" Spiral pipe diameter must be 4” larger than width of grille

Stamped from cold roll steel

Volume Damper Low-Leak OBD 3000-0BDLL-66X12 Smoke-Fire Damper Minimum size is 4"x4"h3. 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.