It all depends on how dirty your air is. I typically get about 2-3 months. Ir you're considering it, I would recommend the following fan. https://www.homedepot

It all depends on how dirty your air is. I typically get about 2-3 months. Ir you're considering it, I would recommend the following fan. https://www.homedepot.com/p/Lasko-20-in-Power-Plus-Box-Fan-B20540/300202629 https://www.homedepot.com/p/Lasko-20-in-Power-Plus-Box-Fan-B... I have 3 running in my home and they haven't been turned off for over 1.5 years, still going strong. The filters I buy at Costco when on sale (3 for $29). This one has been on the fan 24x7 for the last 2 months and is still good for a couple of more. https://imgur.com/JfSjbbg https://imgur.com/JfSjbbg