Not quite an "exact" fit as you can see in the picture. The original K pre-filter sits on top of this product (some dust) and is about 1/4" wider and about 1/8" longer (length not shown). It doesn't hurt as that pre-filter is optional and the main washable HEPA filter catches whatever comes through the sides. I'm deducting a few stars because it's not an exact replica of the Honeywell K filter, but the price is high, so 3 stars is a good rating for it.
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