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w/ Steel Opposed Blade Damper
*Note: Ceramic fiber blade insulation is not UL required on dampers with free areas less than 80 square inches
UL listed and tested in accordance with UL Standard 555C
Blades are parallel to the shortest dimension
Parallel Blade Volume Damper 3000P-28X20 Step Down Ceiling Diffuser w/ Steel Opposed Blade Damperh3. 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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