One is all you need place it on the supply side. Mike
There should not be any smell. Sounds like something is not right. I'd inspect the unit for and signs of heat damage like discoloration.
Hi David, this is not what you should expect. At your convenience, please feel free to contact our tech support team at 1-800-468-1502 Monday - Friday 9 am to 8 pm, Saturday - Sunday 9 am to 5 pm CST.
No ionization. It emits UV that kills bacteria, viruses, and other germs just like sunlight.
Hi there, this unit operates with 120Vac and the Wattage (18 Watts). Please, feel free to reach us at 1-800-633-3991 if additional questions or concerns arise. We'll be glad to assist you.
I installed mine to shine on the coils. The closer the bulb is to the coils the more effective it will be in disinfecting them. I leave mine run continuously and replace the bulb once a year.
Yes, that is how mine is setup in our current home, and how it was for several years in my previous home before this. That said, I wouldn't buy this unit. I've gone through several over the years mostly due to ballast failure in the device. And before someone says it is because it was on the furnace power circuit I should mention that the first failed unit was plugged into an extension cord into an outlet in the basement. It lasted just over a year. The replacement, which went on the furnace circuit, lasted 2.5 years (when we sould the house). In the new house, I purchased another and connected it the same way. Since then it has chewed through 9 bulbs and 2 ballasts. Soon to be three ballasts, and when this one finally fails (bulb or ballast) I'm replacing it with a dual-bulb 95% unit (this one is only 70%) I found online in about the same price range. I've had it with these Honeywell UV light unit.
I have not experienced a negative side affect from my UV light. I do credit it for eliminating mold order from the HVAC vent leading to my bedroom. I am pleased with the results.
THe wavelength is 253.7 nanometers.