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Single deflection transition box mount spiral pipe grille
3 hour fire resistance rating
3/4” Wide x 3/4” High square holes
Available in 4" through 29" round
Parallel Blade Volume Damper 3000P-28X22 past 12 months Single deflection transition box mounth3. Standard Features * 16 gauge galvanized channel frame * Parallel blades are cee 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. Options * 3000 PLL Low Leak Air Control
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