For optimal performance, it is recommended replacing every 3 months.Helps capture larger airborne particles from air that passes through the filter, maximizing HEPA filter life, and reduces unwanted odors.
![honeywell s 50250 vs 17000s honeywell s 50250 vs 17000s](http://ecx.images-amazon.com/images/I/51D228TA9FL._SX425_.jpg)
Fits all Round, QuietCare, SilentComfort Honeywell HEPA air cleaner models and many Holmes, Bionaire, Duracraft models (see models below).