FAQs – A/C Duct UV

Frequently Asked Questions


Q:  Why does UV light kill germs?
A:  UV-C light (the frequency used in germicidal UV lights) kills germs by disrupting their DNA which prevents them from reproducing, effectively killing them.  In nature this frequency of light is filtered out by the earths’ atmosphere so microbes have no defense against it.

Q:  Is it OK to look at the UV light?
A:  Never look at UV light when the bulb is lit.  UV-C light can give your eyes a painful “sunburn”.  Disconnect the unit to work on it.

Q:  Our air system isn’t running so why is the UV light still on?  Is the light on 24 hours a day or only when the blower is on?  Does the UV light stay on when I run my heater?
A:  This product is intended to be on 24 hours a day.  Mold growth doesn’t stop when the blower is off, and cycling the UV light on and off would shorten the life of the UV lamp.

Q:  How can I purify the air when the A/C or heater isn’t on?
A:  Running the system in fan mode will cycle air through the vessel without turning on the A/C or Heater.

Q:  Is there any difference between the low voltage and high voltage (120/220v) voltage systems as far as efficiency of UV protection?
A:  No.  The high and low-voltage power supplies are used to power the same lamps.  The UV light intensity of our lamps is ideal to kill germs but does not damage the air system interior parts.

Q:  My “1 year” UV light still glows after 2 years – do I need to replace it?
A:  Yes.  Over time the UV effectiveness of the lamps decreases even though the lamp my still be putting out visible light.  “1 year” lamp designations refer to effective UV output not when the lamp will burn out.