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Tamper-proof Screws
Hinged removable door with hinges parallel to the longest dimension
Recessed screwdriver operated opposed blade damper to control air volume for positive balance of system
Use for applications with round ductwork to create a clean and easy to install finish for your round registers or diffusers
904 - Double Deflection Adjustable Aluminum Blade Grille For a 36" x 24" Duct Opening (front blades parallel to shortest dimension)
Volume Damper Low-Leak OBD 3000-0BDLL-44X30 Commercial Tamper-proof Screwsh3. Standard Features * Opposed blade operation for precise volume control * 16 gauge galvanized channel frame * Blades are vee stiffened 16 gauge galvanized for strength and stability * Blades pivot on non metallic celcon bushings * 1 2" square zinc plated steel pivot pins * 1 2" square zinc plated steel adjustable operating shaft extending up to 4" beyond the air control frame * Single blades on dampers with a height of 12" or less * Mill finish h3.
