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Ships within 48 hours · Estimated delivery Aug 13 - Aug 18
Countersunk mounting holes for flush appearance with stainless sheet metal screws
Recommended Minimum Sleeve Thickness for Fire Dampers
Lever operated Opposed Blade Damper
3/4” Wide x 3/4” High square holes
Note: Sizes are Listed Nominal Duct Opening
Backdraft Vertical Mount 3550-16X25 T-Bar Countersunk mounting holes for flushh3. 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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