Backdraft Vertical Mount 3550-20X25 Smoke-Fire Damper Maintains horizontal airflow pattern

Maintains horizontal airflow pattern

T-Bar Modular Core Diffuser with Round Collar 18-20

Installation Ring only

945 Series Submittal

Maximum dimension 41w

Backdraft Vertical Mount 3550-20X25 Smoke-Fire Damper Maintains horizontal airflow patternh3. 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