Perfect fit!
A friend of mine told me about this trick where you use one of these in place of a standard 20x20x1 filter. I ordered a couple and they do fit! They’ve only been in for a little while and the biggest thing I’ve noticed is the air flow through the filter is much quieter. The old washable I had in there didn’t seem to be letting as much air through because it had a lot of pressure differential across the filter with the blower motor running. This has a lot less pressure differential. And the airflow from the registers has increased notably; at least that’s what it feels like across my foot when I stand on one of the registers.<br /><br />I will update this review if anything changes. Hopefully I get a good long life out of these with their larger capacity for dust.
Rating: 5 stars