What are the Most Common Air Filter Sizes?

Are you wondering what the most common air filter sizes are? If so, you're in the right place. In this article, we'll discuss the standard sizes of air filters, how to measure them, and where to find them. The most common air filter sizes are 20 x 20 x 1, 16 x 25 x 1, 20 x 25 x 1, 20 x 25 x 4, 16 x 20 x 1, 16 x 25 x 4, 20 x 30 x 1, and 12 x 12 x 1.To measure the size of your current air filter, you'll need to take three measurements: length (L), width (W), and depth (D). The smallest measurement should come first when writing down the size.

If your filter doesn't have any size markings on it, you can measure it with a ruler or tape measure and compare it to an oven filter size chart to find the corresponding oven filter size (also known as the nominal size). If you need to force your air filter into place, try a slightly smaller actual size or a custom-sized air filter. You can find standard one-inch air filters at Lowes, Home Depot, Walmart, or online. Filter King offers hundreds of different filter sizes that can be used in various household systems.

It's important to note that you should never stack several smaller air filters on top of each other to fit them into a larger air controller. If you need help replacing your air filter, many HVAC service companies offer this service in addition to system repair and unit installation services. When buying an air filter, make sure to check the actual size (the dimensions measured by the filter) as opposed to just the model number. This is because many filters have similar model numbers but different actual sizes.

Additionally, it's important to remember that industry standard for air filtration is for filters to measure slightly smaller than their slot or frame so they can easily slide into place without bending or breaking. To ensure that you buy the right size filter for your system, measure the interior dimensions of the air filter inlet before purchasing a new one. With this information in hand, you'll be able to find the perfect fit for your system.