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69% free area * 1308: 7/8" lattice opening
Concealed mounting holes with mounting screws
1/4” crossbars
Recommended Minimum Sleeve Thickness for Fire Dampers
Hinged removable extruded aluminum face frame with signature line marks
Volume Damper Low-Leak OBD 3000-0BDLL-54X22 Step Down Ceiling Diffuser 69% free area * 1308: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.
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