Winix WRF20UL Size 20 Ultimate Cassette; fits size 20 models plus 9500, 9000, 5300, 5000, 5000B
The "Ultimate" in filtration! Winix's very own Ultimate Filter Cartridge fits WInix Air Cleaner Models: WAC9500, WAC9000, WAC5000, WAC6300, WAC5500, WAC5300, and WAC5000B.
  • US Warranty 1 year limited warranty on defects in materials and workmanship.
  • Non-US Warranty: 30 days parts and labor