The topical background to using UVC for HVAC systems is that with the onset of cooler weather the widely recommended option of supplying 100 % fresh air ventilation in order to make buildings safe from the COV-2 threat is looking increasingly expensive. That fresh air is going to need a huge amount of heat to maintain some semblance of comfort for the occupants. Air purification using UVC is another option to make those buildings safe and it does not require heating masses of fresh air.
The applications for UVC air purification fall into a number of groups. There are many applications in buildings that do not have any form of mechanical ventilation, which in the scheme of things are older buildings, and smaller buildings, possibly containing offices and meeting rooms of various types.
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