Contractor-Grade Reliability: 100% genuine OEM construction ensures seamless compatibility with York and Coleman equipment

maintaining the precise air-to-fuel ratio necessary for optimal thermal efficiency

Enhanced Safety: Primary defense against furnace overheating and airflow-related malfunctions

it can safely pass single-phase power by utilizing two of the available poles

Ease of Wiring: Quick-connect terminals and a 30-inch lead length simplify 115/230V dual voltage field conversions

Resideo MARD-12 Damper 319847-401 Contractor-Grade Reliability: 100% genuine OEMThe Resideo MARD 12 Damper is a professional grade 12 inch round modulating damper designed for high performance HVAC zoning and bypass control. Built with heavy duty 22 gauge galvanized steel, this three wire motorized damper is engineered for longevity in both residential and light commercial mechanical systems. It features a 24Vac floating actuator that provides precise control, with a 90 second motor timing for full stroke transition from open to