Enviracaire Replacement HEPA Filter

For Honeywell HEPA/CPZ Air Cleaner Models #51500, 61500 (and similar models: 11500 [EV-15], 11502), 18150 (similar 18159), 11520 (similar 11525 & 11526), 17200 (similar models 17201 & 17210): The performance rating of your Honeywell air cleaner is based exclusively on use with genuine Honeywell replacement filters: True HEPA filter lasts 1-3 years depending upon conditions of use, including operation speed and duration.