Air Con Servicing and Possible Health Risks.

with good reason - the germicidal lamps (mercury vapour, UV-C spectrum) at the sort of power density needed to reliably disinfect cubic feet of air per second also produce noticable volumes of ozone, in much the same way the sun does to the air at high altitude. While this is also a germicide, it is very bad for humans to inhale over a long period.

Heat exchange with fresh air from outside, and HEPA filtering is a better strategy for a normal building. Targeted UV for a hand dryer or something desktop may make more sense, and I know it is seen on air exhausts for experimental cabinets at places like Porton Down handling nasty pathogens, where releasing a bit of ozone is a far more manageable risk than the alternatives that might get pumped out the vents.


'Black light' UV  uses a filter glass to emove the dangerous UV, and is great for making your clothes fluoresce at the disco, and shows up false teeth at least according to one pop song (Oldest Swinger in Town) but has almost no sterilising property. This does not stop 'sterilisers' based on them turning up on Ebay and the like.


To see UV-C  lamps in supplies to water chillers and so on is quite common.

with good reason - the germicidal lamps (mercury vapour, UV-C spectrum) at the sort of power density needed to reliably disinfect cubic feet of air per second also produce noticable volumes of ozone, in much the same way the sun does to the air at high altitude. While this is also a germicide, it is very bad for humans to inhale over a long period.

Heat exchange with fresh air from outside, and HEPA filtering is a better strategy for a normal building. Targeted UV for a hand dryer or something desktop may make more sense, and I know it is seen on air exhausts for experimental cabinets at places like Porton Down handling nasty pathogens, where releasing a bit of ozone is a far more manageable risk than the alternatives that might get pumped out the vents.


'Black light' UV  uses a filter glass to emove the dangerous UV, and is great for making your clothes fluoresce at the disco, and shows up false teeth at least according to one pop song (Oldest Swinger in Town) but has almost no sterilising property. This does not stop 'sterilisers' based on them turning up on Ebay and the like.


To see UV-C  lamps in supplies to water chillers and so on is quite common.