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Allows for 2-way airflow
Square collar designed for a 20” × 20”
Lever Operated Opposed Blade Damper
CB20 - two way
How To Order Spirals
Parallel Volume Damper Low Leak 3000PLL-50X30 Specialty Products Allows for 2-way airflowh3. 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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