Air Furnace Filters

Air Furnace Filters (Buy Now)

Sterling Seal & Supply, Inc. offers a large selection of air filters sizes in various.

Contaminate Removal

Now more than ever, ensuring the air we breathe is safe for the health of our family and co-workers is critical. To learn more about what filter is right for you. Click Contaminate removal comparison.


Our Filters come in a range of ratings MERV 8, 11 and 13. To see comparison FPS and MSF. Understanding filter rating comparison.

Air Furnace Filters


Available in 1", 2", 3”, 4” or 5" depths and several standard face sizes to accommodate most system requirements. Cut Sheets.

When looking to replace your air filter, there are typically two different sizes you need to know, the "Actual size and Nominal size".

  • The actual size consists of the true dimensions of your filter when measuring Length, width and depth (thickness). These dimensions typically include a fraction of an inch within them. For example: 19 1/2 x 19 1/2 x ¾.
  • To determine “Nominal Size” filters are rounded up number to label filter packages. For example, a filter with actual dimensions of "19 1/2 x 19 1/2 x 3/4" will have a nominal size of "20 x 20 x 1", and that will be the measurement to look for when buying your replacement filters.


A seven-strap die cut is located on the air-leaving side of the key Pleat MERV 8 providing additional strength and durability to each filter. The inside of the die cut frame is coated with adhesive to ensure a solid bond at all points of contact with the media Pack. The Pack is sealed inside the frame and Pleat tips are bonded to the stabilizers and diagonal support members. See how they are made.

How Often Should You Change Your Filter?

That depends on a few factors. The thickness and material used to restrict contaminants. As a rule of thumb most common residential filters are replaced once every month to three months. Commercial or higher end filters are typically replaced every six months. To learn more, see our filter replacement chart


Sterling Seal and Supply, Inc. provides several air filter models as an economical replacement of name brands without sacrificing quality or emptying your pockets. Learn more about Brand Comparison.

Product Inquiry

View our Filter Size Chart for a full listing of all sizes and dimensions

Air Furnace Filters