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Locking screw to hold damper in place
Allows for 2-way airflow adjustment
SD52 - Transition Box Spiral Pipe Grille (Single Deflection)
T-Bar Modular Core Diffuser with Round Collar 18-20
Countersunk mounting holes with color matching Phillips Pozidriv screws
Backdraft Vertical Mount 3550-10X10 Smoke-Fire Damper Locking screw to hold damperh3. 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
