This company offers a large assortment of easy to install combination fire/smoke dampers, including units in single section and multiple section sizes. The dampers can be installed either side up, with the blades horizontal to allow for actuator positioning on the right or left where space is restricted. All 1.5 hour rated fire/smoke dampers made by the company are approved for installation out of the plane of the wall, allowing for easy maintenance.

Greenheck, P.O. Box 410, Schofield, WI 54476-0410; 715/359-6171.