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Ships within 48 hours · Estimated delivery Aug 8 - Aug 13
Ceiling opening must be 4” larger in length and width than the nominal duct size
Available 4" thru 40" round
SD52 - Transition Box Spiral Pipe Grille (Single Deflection)
Square to round 2" collar with roll formed retention bead - available in square sizes only
CSFM California State Fire Marshal listed
Opposed Blade Volume Damper 3000-0BD-48X18 past 12 months Ceiling opening must be 4”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.
