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904 - Double Deflection Adjustable Aluminum Blade Grille for a 16" x 8" Duct Opening (front blades parallel to shortest dimension)
Minimum size is 4"x4"
*Note: Ceramic fiber blade insulation is not UL required on dampers with free areas less than 80 square inches
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1" and 1 1/2"
Parallel Blade Volume Damper 3000P-64X64 Step Down Ceiling Diffuser 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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