I have had one for 4 years and it works. It is installed above the coil and
it is on all the time.
Steve

"RBM" wrote in message
...
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