Breathe better! Filters should be changed regularly to ensure good air quality. In addition, dirty filters are the #1 cause of furnace failure. Change your 4” pleated filter every 90 days to ensure you maintain a healthy home and a healthy family. Better yet, take the guesswork out of it and join our Annual Filter Replacement Program! Automatically receive a new filter at your door every 90 days as a reminder to change your filter.