Weil McLain 511-050-216 Venturi Polidoro Assembly SS-FS 399

The Weil McLain 511-050-216 Venturi Polidoro Assembly SS-FS 399 is an air and gas mixing component that regulates airflow features and supports proper fuel-air proportioning within the combustion process. Its venturi configuration creates a controlled pressure differential that assists in drawing and blending fuel with incoming air before ignition. Mounted within the burner section of boiler HVAC systems, it directs the mixture toward the combustion zone for controlled burner operation. Accurate air-fuel mixing promotes stable combustion, uniform flame development, and consistent heat generation throughout the heating cycle.