What is the Standard Size for Air Filters?

Learn about standard sizes for air filters including 1 inch deep AC filters & custom-sized filters ranging from 8x24x1 to 25x30x1.

What is the Standard Size for Air Filters?

Are you wondering what the most common air filter sizes are? The standard sizes for air filters 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.Filters are labeled with three-part dimensions. The first number is its length, the second is its width, and the third is its depth or thickness. When it comes to 1 inch air filters, the oven filter size chart below shows the standard size 1 inch, 2 inch, and 4 inch deep air conditioning filters for your air conditioning, oven, HVAC and Atomic Filters filters. We also offer custom-sized filters.

Select the size to see a collection of oven filters for that size. If you need to know more about MERV ratings, see our Air Cleaner Knowledge Page. Filters are generally listed by Nominal Size, which is a rounded number, based on the actual dimensions of the filter, which are called the actual size. In general, 1 inch pleated AC filters should be changed every 2 or 3 months depending on usage. Environments with smoke, heavy dust (e.g.

desert), or pets may need a more frequent air filter change. When should a filter be changed? A filter must be changed when loaded with particulate matter, as directed by NAFA (National Air Filtration Association). Whole house AC filters with a size of approximately 3 to 6 inches wide can have a lifespan of 6 to 12 months, depending on environmental conditions. If you are replacing the electronic air filter in your oven and you need a 5″×13″×20″ filter, you should first measure the length and width (L x W). If the filter is not square, the smallest measurement goes first).

Scroll down to furnace and AC filter sizes in the table to find your air conditioner and oven filter by make, model number and size. When buying a custom-sized air filter, it's important to remember the difference between nominal and actual size. You wouldn't want to fit a 1 air filter in a 2 slot because the air takes the path of least resistance and will flow around the filter rather than through it if it's not the right size. Colorfil filters, originally built for NASA, help eliminate chemicals and odors at a molecular level that normal air filters can't.If you use a room air purifier and need to replace the filter, it's important to find the correct size replacement HEPA filter. If that doesn't work, you may be able to find the proper dimensions of the air cleaner in your HVAC manual.

But if your system needs custom-sized air filters, keep in mind that we offer custom sizes ranging from 8 x 24 x 1 to 25 x 30 x 1.On the other hand, if the filter is too large, the frame will wrinkle, airflow may be restricted, and longevity will be compromised. Now instantly improve air quality by choosing the right MERV rating because your family deserves the best. If you measure it yourself and find that the filter is not the correct size - either too small or too large - then air will flow around the filter rather than through it and not all of the air will be filtered. Most major retailers such as Walmart, Target and Home Depot offer air cleaners with different varieties of options and brands to choose from. Please note that many filters have similar model numbers so check their actual size (actual measured dimensions of the filter) to make sure you have chosen correctly.

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