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SD34 - Transition Box Spiral Pipe Grille (DOUBle Deflection)
Available in 4" through 29" round
Standard Features * Heavy guage cold roll steel (same as 350 series) * Ideal for return air in the toe space areas between kitchen cabinets
91 Series Submittal
Fixed bars with 0° deflection
Volume Damper Low-Leak OBD 3000-0BDLL-42X16 T-Bar SD34 - Transition Box Spiralh3. 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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