What are the Most Common Sizes of Air Filters?

When it comes to air filters, there are a variety of sizes available. The most common sizes are 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.These numbers refer to the standard size of your home's return ventilation grilles, responsible for controlling the movement of air to and from your HVAC unit. To find the size of the pleated filters used in your home, you don't need to look any further than existing filters. On the outer frame, you will see at least one numbers game.

If you see two sets of numbers, the filter size needed to order replacements is the nominal size, not the actual size. You can ignore the actual size printed on the filter for this task, since the nominal size is the number needed to order new filters. The easiest way to identify the size of the air conditioner filter is to remove the existing filter from its slot and examine the filter frame. Usually, the filter size is printed along the edge of the filter frame.

Note that the size shown in bold type on the filter frame is the nominal size of the filter, which is likely to differ from its actual size. If the actual dimensions do not appear in small print on the filter frame, it is recommended to measure the filter to double check it. The most common sizes of AC filter and furnace filters are air filter 16x20x1, air filter 20x20x1, air filter 16x25x1 and air filter 20x25x1. If you use a room air purifier and need to replace the filter, it is important to find the right size replacement HEPA filter. When purchasing a custom-sized air filter, it is important to remember the difference between nominal and actual sizes. To ensure that the next filter you buy is the correct size for your system, you should measure the inside dimensions of the air filter inlet.

Standard oven filter sizes (also known as standard furnace and AC filter sizes) and hard-to-find sizes are included in a list with actual sizes and MERV options. 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. Round up to the nearest inch to create the nominal filter size, which is the measurement you will use when purchasing a filter. This rounded measurement is known as the nominal size and is used to match the right filter to the corresponding air filter groove. The image of this 12 x 12 x 1 inch air filter has its nominal size printed on it - this is usually how air filters are sold by. Unfortunately, that's not always the case: there are about 20 standard sizes for air filters and none have identical measurements. Using a oven filter size chart makes it easy to find out what size you need for your oven.

Watch a video for guidance on using this chart and listen to expert advice to make sure you make an informed decision and avoid common mistakes.

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