Mammoth BioShieldUV® 72W HVAC UV Light Air Purifier, Whole House UV-C Light in Duct for HVAC AC (Air Conditioning) System - UV Light for Furnance

Great product for the price! The template was accurate for me. I measured the wrong section of ductwork thinking i had plenty of room, but where I ended up putting it was less wide, and it was a squeaker! The ductwork was 16" and the unit was 15 3/4". In hindsight, I would have added a spacer on the outside of the ductwork under the panel to give it a bit more room, but the bulbs weren't touching the far side, and are working fine. I can add a spacer later on. It was near impossible to keep the cutouts from falling in - they are still sitting in there. Ha! This unit replaced a very expensive UV system that was installed incorrectly over the furnace filter. DO NOT install this anywhere near the filter - the UV will shred them, and ultimately plug up your furnace. Also - the old unit did not cover a lot of space in the ductwork. You want to make sure you put this in the longest stretch of ductwork (straight - no corners) that you possible can. The longer the exposure time the air passing through gets, the more efficiently the UV will kill everything. Mine is installed along 20 feet of straight ductwork. I was spending $50 a tube x2 yearly for the old system, plus $140 a year for filters, changing them every 3 months. This unit saves me a lot of money! Two 72W tubes every 6 months for $35.00 available through the company. I am super happy with this! It didn't cost a ton of money, was easy to install, and is cheaper to maintain. And yes, it really works. I'm living in a moldy house, and it keeps me and my dog from becoming ill. I run the whole house fan a lot, so the air is going past the UV quite a bit, and it really makes a difference!

The install was easy. Seems to be working as air quality in my rental "feels" cleaner and my wife hasn't had smell issues so far

It works, I hope this brand last. The other brand didn't last, the lamp ballast failed just after one year. And it was expensive to maintain. The BioShieldUV 75Watt has two bulbs and the cost for two bulbs is 2/3rds cheaper than the old brand with one bulb at 18watts.

It's got a nice metal housing and everything looks solid. BUT when it stops working after 9 months and you look inside to see what failed in this $100 you spent, this little $.50 electrical component was garbage that burnt out.

I was initially impressed with this unit. I read all of the reviews and was prepared for the installation issues regarding the wrong template etc. I used the shipping foam from the box as a template and it worked fine. Now the problem. I installed the unit in the plenum of my AC/Furnace above the evaporator coil. I started noticing a strong burning smell after turning the unit on and letting it run. The unit itself does not feel warm nor does the cord. I opened the access panel to the plenum and the smell immediately knocked me back. This means that the smell is being generated by the bulbs themselves inside the plenum. This is not a smell you can get used to or overlook. It chokes you after a few whiffs of it (at the source). I am disappointed because I had high hopes. The power (72 watts) and the price are both fantastic compared to lowered power more expensive units. I bought this to get rid of smells in my home. However, as much as I want to keep it, the smell it generates is worse than the smell I'm trying to get rid of. If the manufacture can't offer a solution I will have no choice but to return it. UPDATE: 09/19/2022 I contacted the manufacture via telephone and informed them of the bad smell. They immediately apologized and offered to send me an entirely new unit. Estimated delivery date 3-5 days. I will update after receipt and testing of new unit. UPDATE: 09/23/2022 Okay, this company gets 5 stars for customer service and timely responsiveness. I called them on Monday and informed them of the bad smell coming from the unit I originally purchased. They promised to ship me a new one and sure enough I received a new unit four days later. The smell is still present with the new unit but to a much lesser degree. If it does not get any worse, it could become bearable. Based on what I have been reading from other users of UV lights the smell could be ozone, I guess. I am hoping the smell dissipates the longer the unit runs. On another note, I noticed the Amazon price for this unit has gone from $89.00 to $124.97.