Only place I could find in town that stocked whole home Ultraviolet (Uv) light filters on the shelf for purchase! My HVAC system went out and I planned to have it replaced the next day so I also negotiated the deal to include them installing a UV light as part of my HVAC system install. The UV light greatly increases filtration of germs and allergens plus ozone to greatly eradicate odors, cooking, pet, dust, mustiness, etc. Same device hospitals use to filter their air to reduce germs, allergens, and odor. Locke customer service were very helpful on the phone, explaining the two types they carried and were nice enough to give me wholesale pricing when I mentioned I was military. Everything Locke told me about the device, my very very experienced HVAC installer repeated..... A sure sign that I was getting good, accurate, authentic information! My HVAC installers company was advertising similar device for $990 including install, I knew the systems were not that much so I negotiated the install for free and I'd supply UV system. I paid $499 for a better UV light and ozone and I'm very very grateful for Locke Wholesale having the part on the shelf and that they were knowledgable regarding the system. Time will tell regarding durability and longevity but for now I'm very happy with Locke wholesale and I plan to use them again for any other HVAC, electric, and plumbing needs for the future. Yippee Kaya!