If you have to jam your air filter in to install it, you should try a different furnace filter brand or custom size air filter with a slightly smaller actual size.įor common HVAC system brands like Goodman, Lennox, Trane, Rheem York, Coleman, and Carrier, most standard air filter sizes will work. It is better to have a little wiggle room in your HVAC unit slot, so you can easily slide the filter in and out without it getting bent or smashed. HVAC unit slots are usually found near the bottom of your air handler. On the other hand, if your filter does not come within 1-2 fingers’ width of all four corners of your air system handler’s slot or frame: your filter is too small. If you have to bend, force, or jam your air filter into place: your filter is too big. We recommend trying to use methods A or B, referring to the sizes on your old filter or measuring your old filter first, as m easuring the air intake is more difficult, and might not produce the most accurate measurements. The actual size of your air filter should be 0.25”-0.5” smaller than the slot or frame itself. In this case, you’ll want to round down to the nearest whole number to determine the nominal size of your air filter. Then, use a measuring tape or other measuring device to measure the length, width, and depth of the inside edge of the air filter’s slot or frame. Step 2: Measure Your Intake’s Inside Edge. Once again, before you go messing around in your HVAC unit handler or central air return vent, first adjust your thermostat to turn your AC system off. To ensure the next filter you purchase is the correct size for your system, you should measure the interior dimensions of your air filter intake. If your filter’s size is not labeled at all, or you are unsure of the actual dimensions, follow the steps below to measure your air filter: When in doubt, you can always measure your air filter yourself using a ruler or any other measuring device. If the actual dimensions are not listed in fine print on the frame of the filter, we recommend measuring the filter to double check. Note that the size listed in bold on the frame of the filter is the filter’s nominal size, which likely differs from its actual size. Usually, the filter size is printed along the edge of the filter’s frame. The easiest way to identify your AC filter size is to remove the existing filter from its slot and examine the frame of the filter. There are three ways to find your furnace filter size: a) refer to the label on the filter’s frame, b) measure your filter, c) measure your air intake.Ī) Refer to the label on the filter’s frame. When the nominal size is the same as the actual measurements of the filter, the size is listed with “actual size” in parentheses to indicate the filter is true to size. True To Size: Oftentimes, less common sizes come true to size, meaning the nominal size is the same as the actual size.Actual sizes vary slightly depending on the brand, but in most cases, any standard size will work in a standard residential unit.Įxample: 15.5x24.5x0.75” or 15.75x24.75x0.75” The actual size is what you’d find if you used a ruler to measure the exact dimensions of the filter. Actual Size: The actual size of an air filter is typically written in the fine print on the frame of the filter and is usually 0.25"-0.5" smaller than the advertised, nominal size.The word “nominal” comes from the root word “name” and is the rounded-up whole-number version of the actual, measured size. Nominal Size: The nominal size of an air filter is the big, bold, advertised size.When shopping for an air filter, it is important to keep in mind that the air filtration industry standard is to make filters measure slightly smaller than their slot or frame, so they can easily slide into place without getting bent or smashed. Can you stack air filters if you need a thicker filter?.Standard Size Not Fitting Well? Try A Custom Size.We’ve created a simple, but comprehensive sizing guide to help you find the right filter size for your unit without a shadow of a doubt: If your filter is not the right size, either too small or too big, air will flow around the filter rather than through it, and as a result-not all of the air will get filtered.įor many people, air filtration is a confusing, seldom talked about topic where questions often go unasked and unanswered. It is essential to use the right size air filter for your HVAC unit to keep your system running smoothly and to reap all the benefits your air filter has to offer.
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