SCHOFIELD, Wis. — Greenheck has introduced a round industrial control damper to accommodate higher velocities and pressure. Model HCDR-450 is rated for velocities up to 7,000 fpm and pressure up to 30 ...

The EZ Wire™ plug-in zone damper system can be installed in new installations of square or round ducts. Plug-in dampers; standard telephone cord; energy-efficient, low-voltage DC motors; screwless ...