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The Holmes APF-6 is the correct replacement prefilter for the following models of air purifier:
The Holmes Foam Air Cleaner Prefilter 2pk APF-6 works to clean large particulates from your indoor air. This Holmes foam prefilter will extend the life of HEPA carbon filters. This replacement prefilter has approximate dimensions of 11 3/4" x 13 1/2" x 3/8".
The Holmes APF-6 specifications: