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remove the two center cones as a unit and reposition the six screws
blades prevent metal on metal rattle
Options * MAR - Mounting Angle Ring (sold in pairs - 2 needed
Uniform 360 degree discharge pattern
*Note: Ceramic fiber blade insulation is not UL required on dampers with free areas less than 80 square inches
Volume Damper Low-Leak OBD 3000-0BDLL-34X30 T-Bar remove the two center conesh3. 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.
