within a furnace or heat pump, there are lots of factors, it might be nearly impossible to insure the UV light reaches each and every inch. Only sure wavelengths is going to be productive for germicidal Regulate. https://reganqswf314278.wikiannouncement.com/7384796/the_smart_trick_of_how_uv_lights_extend_hvac_system_life_that_nobody_is_discussing