They already have UVC disinfection in ventilation systems—but you need to circulate a ton of air for it to be really effective, so one of the key benefits of Far-UVC—not needing to change existing buildings or install expensive new systems—is lost.
Also, if I were going to put a UV lamp in an air duct, I wouldn’t make it 222nm. IIRC other wavelengths (e.g. 254nm) are more effectively germicidal and are mainly bottlenecked by safety issues, which don’t apply in this context.
They already have UVC disinfection in ventilation systems—but you need to circulate a ton of air for it to be really effective, so one of the key benefits of Far-UVC—not needing to change existing buildings or install expensive new systems—is lost.
Also, if I were going to put a UV lamp in an air duct, I wouldn’t make it 222nm. IIRC other wavelengths (e.g. 254nm) are more effectively germicidal and are mainly bottlenecked by safety issues, which don’t apply in this context.