These AC filters are just over half an inch smaller than the label says. I have an 18" x 24" hole, but the filters marked 18" x 24" were only 23 3/8" wide and could be sucked into the vent even if you tried to tape them to hold in place.So I figured I needed an 18x25" filter and ordered the exact same brand in 18x25. They are too big at 3/8" and I was able to fit them with a light crimp. I need a filter that is exactly 24" wide, not 23 3/8 or 24 3/8. I've never had a problem buying 18 x 24" HD filters. They are labeled by size. I now have ten filters that won't fit in my 18" x 24" intake port. They are either too small or too big and I am having to fight to return them and buy them in HD which are 24 inches wide as advertised.
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