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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
The Holmes HAPF21 is the main filter in the following air purifiers:
This Holmes air filter is also known as part number HAPF21CS.
This filter should be replaced every 1-2 months for optimum performance.
Price is for 1 filter.
The Holmes HAPF21, 9000436 Replacement Filter specifications: