My furnace/AC was installed about three years ago. It uses 16" X 25" X 5" filters. The problem is when I try to find a replacement at my local home center: at Lowe's, Home Depot, (you name it), I found only 1" or 2" thick filters (mostly 3M Filtrete). I looked in many stores around my area, not just one. I also checked at my local Costco and Walmart but they have none: the associates told me that they didn't carry the filters anymore and that I may need to order them online.
So, the question is: Are 5" thick filters still in use and available? Is it an uncommon size filter? Or do the thin filters have better performance?
Additional Information: the filer that we are talking about is Honeywell FC100A1029.
Best Answer
The thicker the filter, the more area can be created within the filter by folding the filter materials into baffles. This creates a very high efficiency filter, but I don't think I've ever seen one this thick stocked in a store. I'm sure you could resize the opening for a thinner filter, but if it was my choice, I'd order the thicker ones online.
The same thing happens in other places, e.g. high efficiency toilets have a larger flapper than what is typically stocked in stores, which will make getting replacement parts a pain.