The Marvair 92219-2 Economizer Board is a specialized HVAC control component designed to manage economizer functions in commercial rooftop units (RTUs), air handling units (AHUs), and other ventilation systems. It monitors outdoor air conditions and automatically regulates damper operation to introduce fresh outside air when conditions are favorable, reducing reliance on mechanical co... https://www.partshnc.com/92219-2-marvair-economizer-board