Genuine Whirlpool® Replacement Pre-Filters, 4-Pack (Part # 817500) to replace the pre-filter that comes in Whirlpool Whispure™ Tower Air Purifiers, including the Whirlpool APT40010R Tower sold by National Allergy. The charcoal pre-filter reduces odors and captures larger airborne particles to help prolong the life of the HEPA filter(s). Change pre-filter every 3 months, depending on use. Package contains four (4) Pre-Filters - a one-year supply!
Note: Does not fit the APMT2001M Portable Tower.
Please see Owner's Manual tab for full instructions on changing the pre-filter.
NOTE: Do NOT immerse the pre-filter in water - it is NOT washable.