"RBM" wrote in :

A customer of mine inquired about a UV filter to install in or on a
central AC air handler to kill mold growing inside the cabinet and
duct. Is anyone familiar with these, that can give me any detail on
how and when they are used and work.

tia, Roy

I think you may want to google for germicidal lamp. A fluorescent-like
tube made of quartz glass, which lets UV light through. Handle with care,
ie gloves or with clean paper, because fingerprints will damage the tube.
Don't look into the light, and don't expose yourself (sunburn and worse).
Used in biological safety cabinets (tissue culture hoods) to keep them
sterile.

Glass absorbs UV.
--
Best regards
Han
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