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Ships within 48 hours · Estimated delivery Sep 1 - Sep 6
14 gauge steel construction
One-piece removable slide damper for off-season closure
Tamper-proof Screws
1/2" spacing dual angular louvers for strength and maximum free area
Backdraft Vertical Mount 3550-24X32 T-Bar 14 gauge steel constructionh3. 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
