Freshen the air in your home or office with our 4 inch air filters. With standard, hard-to-find, and custom sizes available, we know you'll find exactly what you need to improve your air quality. As you increase the MERV rating of your 4 inch
furnace filter, the filtration efficiency also increases. Choose the rating that is right for you and best accommodates your individual needs or preferences.
Our 4 inch filters offer the following features:
Select your specific 4 inch air filter measurements below or shop extended sizes.