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:
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%
24 x 24 x 4" Filter
From $30.29
25 x 25 x 4" Filter
From $35.11
24 x 30 x 4" Filter
From $35.11
20 x 30 x 4" Filter
From $30.31
20 x 25 x 4" Filter
From $25.73
20 x 24 x 4" Filter
From $27.11
20 x 22 x 4" Filter
From $30.31
20 x 20 x 4" Filter
From $25.73
18 x 30 x 4" Filter
From $30.31
18 x 24 x 4" Filter
From $27.11
18 x 20 x 4" Filter
From $28.71
18 x 18 x 4" Filter
From $28.71
16 x 25 x 4" Filter
From $25.73
16 x 24 x 4" Filter
From $28.69
16 x 20 x 4" Filter
From $27.11
16 x 16 x 4" Filter
From $23.91
14 x 30 x 4" Filter
From $28.71
14 x 25 x 4" Filter
From $28.71
14 x 24 x 4" Filter
From $28.71
14 x 20 x 4" Filter
From $23.91
14 x 14 x 4" Filter
From $20.69
12 x 30 x 4" Filter
From $27.11
12 x 24 x 4" Filter
From $27.11
12 x 20 x 4" Filter
From $18.15