BSG AIRSTREAM ASD treats the air that travels down the duct, UVC lamps are installed in the plenum or main body of ductwork and downstream of the air blower. BSG experts will calculate the required cleaning efficacy, using air movement and UVC science to identify the required cleaning disinfection rates. Our technology can be scaled according to customer specifications: 99.9%, 99%, 95% … reduction on airborne Coronavirus in one pass.