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1x2 T-Bar (8" x 20" duct)
Adjustable steel curved blades
904 - Double Deflection Adjustable Aluminum Blade Grille For a 20" x 8" Duct Opening (front blades parallel to shortest dimension)
Designed to minimize vision into the air duct
* 2550 - Round Spring actuated (6) damper for vertical or horizontal mount
Backdraft Vertical Mount 3550-26X16 Accessories 1x2 T-Bar (8" x 20"h3. Standard Features * 3550 Vertical mount * 3560 Horizontal mount air up * 3570 Horizontal mount air down * 3580 Round sizes available 5" to 24" * All non motorized backdraft dampers * Dampers are opened by air pressure differential and closed by gravity * 16 gauge channel frame with 26 gauge galvanized blades * Out of airstream linkage * Blades are vee stiffened 26 gauge for strength and stability * Square steel pivot pins * Nylon bushings * Single
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