Backdraft Vertical Mount 3550-28X24 Smoke-Fire Damper *Pricing is based on standard

*Pricing is based on standard 14 GA steel construction

Ceiling opening must be 4” larger in length and width than the nominal duct size

Opposed Blade Damper standard on 4" widths

Standard Features * 1/2" spacing dual angular louvers * 22 & 20 gauge cold roll steel * Mullions are reinforced with stiffeners for greater strength * For applications where greater air volume is required * Install with louvers in up or down position for best duct concealment * Countersunk mounting holes for flush appearance with color matching Phillips posi-drive screws * Soft White Options * Tamper proof screws * Standard Color

CB30 - three way

Backdraft Vertical Mount 3550-28X24 Smoke-Fire Damper *Pricing is based on standardh3. 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