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The Holmes APF4 is the correct replacement for the following air purifiers:
The Holmes APF4 Purifier Carbon Pre-Filter removes contaminants and large particles from the air for better breathing. Also known as part number APF4, this foam carbon pre-filter helps to extend the life of the HEPA carbon filter.
The Holmes APF4 Carbon Pre-Filter Replacement specifications:
The Holmes Air Cleaner/Ionizer offeres three speeds while ionizer function and ionizer has an ON/OFF switch. The air purifier will filter the air in a 10 x 14' room in ten minutes. The Holmes air purifier also helps to reduce airborne allergens, odors and pathogens.