What are the Most Common Air Filter Sizes?

Furnace filters come in a range of sizes, and different brands and types of furnaces use different filters. The most common furnace filter sizes are 10 X 20, 14 X 20, 16 X 24, 18 X 30, 12 X 12, 14 X 24, 16 X 25, 20 X 20, 12 X 20, 14 X 25, 18 X 18, 20 X 24, 12 X 24, 14 X 30, 18 X 20, 20 X 25, 12 X 30, 15 X 20, 18 X 24, 20 X 30, 12 X 36, 16 X 20, 18 X 25, 4 X 24, and 25 X 25, and these sizes range in depth from 1 to 6 inches.

Standard Furnace Filter Sizes

While there are no standard furnace filter sizes that will fit all models, the most common filter dimensions include:

  • 10 X 20
  • 14 X 20
  • 16 X 24
  • 18 X 30
  • 12 X 12
  • 14 X 24
  • 16 X 25
  • 20 X 20
  • 12 X 20
  • 14 X 25
  • 18 X 18
  • 20 X 24
  • 12 X 24
  • 14 X 30
  • 18 X 20
  • 20 X 25
  • 12 X 30
  • 15 X 20
  • 18 X 24
  • 20 X 30
  • 12 X 36
  • 16 X 20
  • 18 X 25
  • 24 X 24
  • 25 X 25

Finding My Air Conditioner Filter’s Sizes

When replacing the filter in your heating and cooling system, look to the existing filter for sizing. The filter dimensions should be printed on the frame of the filter, length x width x height. When shopping for a new filter, make sure you purchase one that is the same size, or it will not fit properly into the furnace filter cabinet.

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