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Ships within 48 hours · Estimated delivery Aug 11 - Aug 16
Extended sleeve (2751)
Fan shaped 1/2" spaced louvers
22 gauge butterfly style galvanized steel blades
T-20 Tamper Proof Screws
For evaporative coolers or central blower systems
Volume Damper Low-Leak OBD 3000-0BDLL-20X12 Smoke-Fire Damper Extended sleeve (2751)h3. 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.
