About the Honeywell MARD8 8" Round Modulating Damper
Honeywell MARD8 8" Round Modulating Damper. The MARD series damper is a power opened/closed, zone or bypass damper. It is usually used in light commercial applications on systems larger than 5 tons that do not exceed 2" W.C. at the damper, but may be used in any residential system a well.