Filterbuy 20x20x1 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.50 x 19.50 x 0.75 Inches)

They work well! Quality filters. Will buy again again. This is all we use in our new house.

The filter is a Merv 13. The price for 4 is reasonable and they are US made. I have used them before and I am totally satisfied with their performance.

These filters are high quality, reasonably priced and well packaged for shipping. They fit well in our ceiling returns. They've only been in for a couple days but we already notice the difference between these and the lower quality filters we had in earlier.Equally as important, customer service from this company was top notch. I mistakenly ordered the wrong size and going through the Amazon return option was going to cost as much as the filters themselves. I reached out to the seller and had an immediate response and a very helpful solution. Will definitely be a repeat customer.

Good price and product works well. Comes with quite a few filters but a couple of mine were missing hence the 4 star review as opposed to 5. My kitten wouldn't drink from standing water but immediately started to drink from the flowing water!

These filters are great. My only issue is they are sized 20x20x1, which is the size I needed, but they are much smaller than the 20x20x1 filter I needed to replace. This filter definitely doesn't fit totally correctly. I don't think it's not doing its job, BUT it definitely is smaller in size than advertised. Just beware of this fact before you purchase.