Greenheck has introduced a round industrial control HVAC damper to accommodate higher velocities and pressure. Model HCDR-450 is rated for velocities up to 7000 fpm and pressure up to 30 in. wg, and ...

Since volume control dampers are seldom if ever used with axial fans, only centrifugal fan applications will be considered here, and further limited to square/rectangular fan discharge openings. There ...