Volume control dampers are used in air ducts to control air volume. As a result of the mechanism employed the blades work in opposite directions. Manually controlled volume dampers are adjusted manually to the air volume requires and the locking mechanism on the handle is used to maintain the specified level of air.
On request, they can be manufactured to incorporate 24V and 240V servo-motor control. Externally driven gear manufactured from plastic injection method is used as standard. Where plastic gears cannot be used, special bronze bearing bears can be manufactured.