Aprilaire 401 accordion type genuine replacement filter media for 2400 models and Lennox PMAC-12C air filter systems. The 401 filter helps to decrease the amount of contaminants which can cause sinus irritation, allergic reactions and asthma attacks. The 401 filter is MERV 10 rated to efficiently decrease mold Spores, pollen, dust mites, bacteria, smoke and pet dander in your home.
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