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Ships within 48 hours · Estimated delivery Aug 20 - Aug 25
3/16” holes on 1/4” staggered centers Extruded aluminum frame with signature line marks Perforated material 58% free area Countersunk mounting holes for flush appearance with color matching Phillips posi- drive screws Rust resistant pre-coat with durable powder finish Soft White
Options * Sleeve variations * Mounting flange * Adjustable counter balance to adjust various opening pressures
165° replaceable fusible link
Adjustable directional dampers with shut-off
Backdraft Vertical Mount 3550-32X12 T-Bar 3/16” holes on 1/4” staggeredh3. 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
