Whirlpool Compatible 8171433K Charcoal Pre-Filters (2-Pack) are pre-cut to replace the pre-filter that comes in Whirlpool Whispure™ AP150 or AP250 air purifiers. Can also be used to replace Whirlpool's previous 8171433 and 1183062 pre-filters. Activated charcoal pre-filter reduces odors and captures larger airborne particles before they reach the HEPA filter. Change pre-filter every 3 months, depending on use. Package contains two (2) Pre-Filters – a 6-month supply!
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.