GlasflossIndustries ZLP 20x20x1 Z-Line Series ZL MERV 10 Pleated Filter. Case of 12

Had problems with the paper ones distorting into the tube. These are nice and sturdy. A little noisier than the paper ones when the heater turns on when they get sucked up and seal. I put some self adhesive weather seal to take up the extra space and that problem is gone.

This product is easy to change. There are discrete instructions on each filter for correct replacement.The filter works well with my A/c furnace and I've bought these filters for several years changing the filters usually on a monthly basis.There are 12 filters to the box that is easy to store in a closet for a year's worth of good air filtering.

Very sturdy for high flow system . Been using this brand for about two years and only one cosmetic flaw out of three cases . Only negative with any thick pleat filter is you will seem to get a small whistle at filter but not noticeable unless close distance to your filter return .

The fit was as needed and the quality was much better than many filters of much higher prices. Will definitely buy it again.

This is a great product coming from a great company. Thank you so much for your undivided attention and thank you for fixing the situation I thank you for going above and beyond to make it right

These filters have a much better fit than any other filter. If you look at your filters measurements, you will see that it is not exactly 20x20. It is actually slightly larger. These filters are slightly smaller than other filter brands, which allow them to make a much better fit. Which must explain why they are so difficult to find anywhere else. They are fantastic.

They are all I have been using for years with no problems.

Worked as advertised. One of the filters looked like there was a slight gluing issue, but all in all, works just fine. Proper fit (not too small or big), Packaged in a big opaque plastic bag. Great price versus big-box stores.