I don't know why, but every furnace seems to have different size filters. The designers must throw darts at a board to see what size it should be!My furnace needs 20x21x1 which is extremely odd. Other filter websites want to sell me a custom-made filter for a ton of money, but FilterBuy has them off-the-shelf for a great price!The filter is adequate. It's not as sturdy as a pricey filter from the big hardware stores, but then it's only half the price and it holds up long enough to be installed, last for 3 months, and be removed. They always come out dusty so I know they're working.Thanks for making a good, hard-to-find product at a reasonable price.
I heard about you through a non-sponsored video on YouTube. RR Buildings said he buys from you. I looked y'all up and needed a size filter I couldn't find in ANY big box store...so I ordered 'em. They came in a few days and I'm on the first filter now. Easy and quick; I like it!
Order came quickly and fit in our furnace perfectly. Have brought filters at big box stores that were to large for opening even though they were suppose to be the right size. Very good quality.