Well packed quality filter that fit to replace the overpriced Honeywell that came with the Trane Air Handler.

why they would call anything 20x20x5 if it's not?

2x4s are not 2x4 because after milling the surfaces smooth(ish) they take 1/4 inch off all 4 sides, this is stamped and folded cardboard, there is no reason for it to NOT be 20 inches by 20 inches by 5 inches. If it's not it should be marketed as such.

Actual dimensions I think are listed somewhere in the product description but I did not notice that when I purchased it. as measured it actually even has a slightly longer side. One side is just over 19.75 inches and the other is just over 19.5 inches by 4.25 inches.

It barely fits in the enclosure space of our furnace where our last filter fit nice and snug. We can fit either 4.5 or full 5 inch filter, but it's designed to hold an exact 4.5 x 20 x 20 inch filter.

PROs:
Has a thin layer carbon filter to reduce random odors.
Has a MERV14 rating (but if the dimensions are not accurate I wonder about it's merv rating)

CONs:
Not actual dimensions, smaller than our previous brand, barely fits in the enclosure space.
Expensive

Overall I still am giving a good rating as it is still a good filter, although expensive for not being the same as the listed size (right in the title says 20x20x5 but it's not)
It is my own fault for not reading the fine print, I never expected a lump of cardboard would be undersized from it's listed dimensions. I guess they assume everyone expects things to be smaller than they claim. Double check your furnace space and verify with product dimensions and proceed with caution I guess. What happened to a time when your furnace says it uses a size and you could go out and buy that listed size and it would just fit?

This filter is of EXCELLENT and SUPERIOR quality compared to the filters that my HVAC company provides for system maintenance. I had always trusted my installer and maintenance company to replace with the best filters, and they charged me over $40 for each filter (two units means two filters for every change out). Fast forward to August 2023, I decided to try out these filters after reading some reviews. I bought a set of two Nordic Filters for around $50. I was able to have them shipped in an Amazon box at no extra charge to prevent crushing of the filter boxes. To my amazement, each filter is encased in one of the sturdiest, non-crushable boxes I have seen in a very long time! Way to go Nordic Pure on protection for your product and thank you Amazon for extra shipping protection. These filters are of such high quality that I now have them on Subscribe & Save through Amazon. I hope I can stay locked in at this exceptional price.

Great fit!

Good value, quality all around!