Disposable Panel Air Filter 20" x 30" x 1" - Case of 12 Review

These filters are marked 20" x 30", but in reality they are 19 5/8" x 29 1/2". The flange around the edges of my filter enclosure is too narrow, these just fall through. I cannot understand how someone can get away with labeling something incorrectly like this.I wonder if all of there sizes are mislabeled?

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Product Description:
Scrim backed AmerGlas filters are designed for general air filtration applications with light to medium dust loading conditions. They are used in all types of HVAC systems to protect the coils from accumulating a build-up of dirt or as pre-filters to extend the life of higher efficiency filters.

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