Do Air Filter Sizes Need to be Exact?

When it comes to air filters, size matters. If the filter is too small, it won't be able to do its job properly and some of the air (and dirt) will not pass through. On the other hand, if the filter is too large, the frame will wrinkle, air flow could be restricted and longevity would be compromised. It's essential to use an appropriately sized air filter for your HVAC unit to keep the system running smoothly and take advantage of all the benefits that the air filter offers.

In most cases, you should be able to use the closest standard size. To determine the right size for your unit, you'll need to measure the length, width, and depth of the inner edge of the slot or frame of the air cleaner. 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. Then, use a measuring tape or other measuring device to measure the length, width, and depth of the inner edge of the slot or frame of the air cleaner.

In this case, you'll need to round down to the nearest whole number to determine the nominal size of the air filter. Air conditioning filters are available in many different sizes, so it can be overwhelming if you're not sure what size filter you need. You can find the recommended filter size for your unit model here in the table titled “Find your air conditioner and oven filter by make, model number and size”. It's best to have a little wiggle room in the slot of the HVAC unit, so you can easily slide the filter in and out without it bending or breaking.

However, it should fit snugly in the air cleaner compartment with a little space around the edges. As for depth measurement, standard air filter sizes are nominally 1 (0.75 reais), 2 (1.75 reais) and 4 (3.75 reais) deep. Another caveat is that, given the relationships between the supplier and the supplier, they could be encouraged to increase sales of certain types or brands of air filters. I had bought the wrong size filter and you guys did everything you could to get me the right ones. Here's an interesting fact: 70% of what Filterbuy sells doesn't exceed the 10 most common air filter sizes.