PS Essentials Source Capture & Air Purification Unit (Dual Inlet)SELECT COLOR: (White, Black, or Grey) The HealthyAir Source Capture Fan Filter Exhauster Dual Station system is engineered to extract airborne particulate and dust from the breathing zone to improve indoor air quality and reduce occupational hazard risks. This unit can used for air purification without being connected to a building's HVAC system, but is primarily designed for use as an Outside Ventilation unit, whereby the system is designed to take