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6 in. 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 in. W.C. at the damper, but may be used in any residential system as well.
Maintenance/Product Reference Materials-Zoning System Design Manual (English)
Installation Materials-Installation Instructions for Modulating Automatic Round Damper (MARD) (English)
Floating SPDT Actuator with 35 lb-in., non-spring return, 24 Vac ±20%