The Honeywell F100 20 x 25 media style air cleaner is a whole house air cleaner that uses a disposable filter media to remove airborne particles from the air. This Honeywell air cleaner series includes F100F2010, F100B1032, F100F1087, F100E2044 and F100F1038. Its filter media must be replaced every 6 months if you have heating and cooling or every 12 months if you only have heating.