I bought a box of 6 filters 18x20x1 - Airx Dust and didn't think about it anymore. To this day when I tried to install the first one out of the box. The filter really fell on the floor on my stove block! I had to take a hook to catch it. The label says it's 18" x 20" x 1" and if you read carefully you'll see that the actual size is (really?) 17 1/2" x 19 1/2" x 3/4". Well, the filter I used measured slightly less; Probably closer to 17 1/4" x 19 1/4" x 3/4" so there's no room to play. If you're considering buying these filters, measure your unit to see if they fit. Please note that the size may run slightly smaller than advertised. My only regret was not trying to install it when the filters first arrived. Guilty!
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