AfterMarket Replacement Whirlpool Whispure Portable Tower Air Purifier Pre-Filter 817100 4-Pack By Breathe Naturally Aftermarket 4-pack of Carbon Activated Pre-Filters Use in All Mini or Portable-Tower Whirlpool Models: APMT2001M and other APMT models Extends the life of your HEPA filter....Helps deodorize the air and traps larger particles such as dust, lint, fibers and pet fur Reduces common household odors with activated carbon Made in the USA