Model OBD is used on registers and grilles. OBDDM is used for duct mounting. Opposed-blade dampers have vertical blades that move in opposite directions to control air volume over the entire face of a register or grille.
Interwoven tension spring on blade pivot points permits positive setting from full-open to full-closed. Blades are screwdriver operated. Extremely shallow depth allows damper use in shallow stackheads.
Extruded aluminum or steel. Mill finish standard.
OBD14 available for use on 1400 series only.
Hart & Cooley, LLC.
5030 Corporate Exchange Blvd. SE Grand Rapids, MI 49512