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2" ADC compliant round collar with a bead for ease of installation
3/4" round collar
Standard Features * Cones are one-piece stamped construction providing a clean
* 2634 - Square or rectangular Spring actuated (6) out-of-airstream fire damper for horizontal or vertical mount
425 Series Engineering/Performance Data
Backdraft Vertical Mount 3550-28X32 Specialty Products 2" ADC compliant round collarh3. 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
