As best I can tell, they appear to work fine. But how does one really know? They are replacing the filters in the house when we bought it new which were MERV 16. Those are difficult to find and more expensive when you find them. So we will see.
Got a second shipment today, which was meant to replace and incorrect first shipment. They are still the same WRONG size. Now I have seven filters that are of no use to me. (How come there were only three filters in this second batch?) Can you help me get this straightened out. I paid for four 15 x 25 x 5 filters. I now have seven 20 x 25 x 5 filters. Can you put someone on this and get it straightened out>
I love it, and after 2 days I saw a big difference in my home compared to the previous filter I use to get, Im so glad I found your company and will stick with the merv 13 rating, great product and you have gained another satisfied customer