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The Daring Dufas[_7_] The Daring Dufas[_7_] is offline
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Default Central AC UV filter

John Grabowski wrote:

"RBM" wrote in message
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"John Grabowski" wrote in message
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"RBM" wrote in message
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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.


*Roy it sounds as though you want ultraviolet lights for inside the
ductwork. I've seen these used in hospitals, but I don't have any
details. I have also seen the ones used on water filtration units
connected to wells. The idea is that the UV light kills bacteria.
Try talking to an HVAC company.



Thanks John, I don't know who initiated this, possibly the HVAC
service company, and the homeowner is trying to get other opinions.
From the homeowner description, it's just going to be some type of UV
light installed in or on the air handlers. The claim is that there is
mold growing inside, and the UV will kill it. I've worked with the
ones on spas, and water systems, but I've never seen anything like
this. It didn't sound like they were going to be installed throughout
the duct, as you describe, which makes sense to me, just something in
the blower. He didn't give me a number, but said it was wicked
expensive. A Google search didn't turn up anything that was convincing
to me. I suppose I should have him get more specifics from the
contractor, so I have something more tangible to look into.



*Roy I'm thinking if there is existing mold in the ducts that a
remediation company should come in and clean first. The Ultraviolet
lights are only placed near the air handler to my knowledge, not
throughout the duct work so they would not do much for anything beyond.
I would think that the source of the mold should also be addressed
rather have something to keep the mold under control. Perhaps moisture
is getting into the ducts and condensing or they are up against a moist
surface such as a basement wall.


The UV light around the evaporator coil kills the
the micro-critters that can grow on the wet coil.
That area of any HVAC system is where microbes can
grow because that's where a lot of water and debris
can collect. Some evaporator coils are coated at the
factory with an antimicrobial compound that will help
kill off the little beasties. Anything that can kill
mold and mildew around the evaporator will also keep
the odor level down. I've seen yeast grow in the darn
things, some folks like to bake their own bread.

TDD