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

ensuring burner tube ports align perfectly with the orifices

the VS series is designed for both hot/chilled water (up to 50% glycol) and low-pressure steam applications up to 15 psi

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

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

Resideo MARD-12 Damper 319847-401 maintaining the precise air-to-fuel ratioThe 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