Having lived in the same house and buying the same size filters for 24 years, these are the smallest filters I have ever seen. I have had filters from Honeywell, 3M Filtrete and Perfect Pleat in the past and they all fit snugly in the filter compartment of a standard recirculation grille. At least 1/8 inch is left after installing one of these filters. - 1/4" clearance on three sides to allow unfiltered air to pass through the filter. That's a shame because they're actually well built for the money, but because they're that size and let unfiltered air and dirt into my house Coil These filters are free.
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