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UL listed and tested in accordance with UL Standard 555C
Designer Color or Other Finish available on this product
Countersunk mounting holes with color matching Phillips Pozidriv screws
904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 8" Duct Opening (front blades parallel to shortest dimension)
Recommended Minimum Sleeve Thickness for Fire Dampers
Volume Damper Low-Leak OBD 3000-0BDLL-20X16 Accessories UL listed and tested inh3. 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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