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:
A Variety of Sizes, Including Standard 14x4 Air Filters & Custom Options
Superior, Made-in-the-USA Quality
Lower Price than You'll Find Anywhere Else
4 MERV Ratings for Enhanced Filtration Efficiency
4" Air Filters That Can Reduce Your Energy Costs By Up To 15%