Backdraft Vertical Mount 3550-28X24 Smoke-Fire Damper Modern step-down design with 4-way

Modern step-down design with 4-way air diffusion

CB30 - three way

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

Extruded aluminum frame with signature line marks

Standard Features * 1/2" x 1/2" x 1/2" aluminum lattice face *

Backdraft Vertical Mount 3550-28X24 Smoke-Fire Damper Modern step-down design with 4-wayh3. 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