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904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 20" Duct Opening (front blades parallel to shortest dimension)
22 gauge butterfly style galvanized steel blades
blade to blade neoprene seals
Allows for 2-way airflow
Parallel Volume Damper Low Leak 3000PLL-72X72 Smoke-Fire Damper 904 - Double Deflection Adjustableh3. 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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