Honewell Media Filter F66A
The Honeywell F66 air cleaner is a media style air cleaner that uses a special accordion style filter media. This filter media must be changed every 6 months if you have heating and cooling and every 12 months if you only have heating. Honewell F66A media filters are not cleanable or washable. Failure to replace the filters often enough may cause problems with your heating and cooling system.
Honeywell 197983E or B Replacement Filter Media