Also you don't install wall mounted products in large buildings, it makes more sense to use products like this: https://easyupload.io/m/017vi2 And yes UV lamps have to be replaced, I don't know how often I need to look into that when I have time. Perfect opportunity for places like theaters as one example. Want to sit in a room full of people with dirty air circulating? This technology works, hospitals use it, and you call it a scam. Makes sense.