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Negator stainless steel closure springs mounted on spring pin brackets
Blades are parallel to the shortest dimension
165° replaceable fusible link
and handle
Nylon bushings on adjustable blades prevent metal on metal rattle
Volume Damper Low-Leak OBD 3000-0BDLL-68X52 Specialty Products Negator stainless steel closure springsh3. 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.
