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Can you substitute generic filters for those expensive ones required in Air Purifiers?

My mother-in-law gave me two old air purifiers and is it really hard to find filters for them and they are very, very expensive. Can I use a generic furnace type air filter instead?


Typically, filters in air purifiers are HEPA type filters. That means that they are 99.97% efficient down to 0.3 microns. Your furnace filters (yes, even the Ultra-Allergen) is only 20% efficient at 0.3 microns. You will be better off finding the right

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    Purolator F312-14241 Hvac Fiberglass Furnace Air Filter 14 X 24 X 1 (Pack of 12)
    Automotive Parts and Accessories (PUROLATOR PRODUCTS)


    PUROLATOR PRODUCTS

    Price: $13.59


    • Space saving notched frame
    • Fiberglass
    • Size Ins.=14 x 24 x 1

    American Air Filter 220-319-051 Disposable Panel 12 x 24 x 1 - Case of 12
    Single Detail Page Misc (American Air Filter)


    American Air Filter

    Price: $15.84


    • Strong chipboard framing for longer storage life
    • Constructed with AAF manufactured premium grade fiberglass media
    • Higher dust holding capacity

    American Air Filter 220-208-051 Disposable Panel 10 x 24 x 1 - Case of 12
    Single Detail Page Misc (American Air Filter)


    American Air Filter

    Price: $18.00


    • Sturdy economical disposable panel filters, twelve per case
    • Double skinned, resistant to compression
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    American Air Filter 180-935-800 Air Demon Filter
    Home Improvement (American Air Filter)


    American Air Filter

    Price: $23.74


    • Sell Pack is ONE filter.
    • Ultra high efficiency filter - rated Merv 11
    • 33% more air flow than other filters / Lower energy costs & cleaner air

    Purolator Dpm7-1622141 Furnace Air Filter 16"x22.25"x1" (Pack of 12)
    Automotive Parts and Accessories (PUROLATOR)


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    • "PUROLATOR" FURNACE AIR FILTER
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    • Cut to size air filter pads.

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