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2" ADC compliant round collar with bead for ease of installation (square sizes only)
Standard Features * 2649 - Round damper for vertical mount only
Front blades are parallel to the shortest dimension
Retainer cables are provided on sizes 12" and larger to allow the inner cones to hang securely while adjusting the diffuser
Building materials rated 3 hours or less
Parallel Blade Volume Damper 3000P-72X36 Specialty Products 2" ADC compliant round collarh3. 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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