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Measure your air filter’s length, height, and thickness (depth) in inches. Use a flat ruler or tape measurer to complete the measurements. Measure your filter with the steps below.
COMMON PC FAN SIZES MANUAL
If your current filter isn’t labeled, take manual measurements. If the filter fits properly, order a filter with the same nominal size from any manufacturer. The listed dimensions are your filter’s nominal size. Turn your thermostat off and remove your air filter.Ĭheck the label, which should be on the side of your filter. If your filter is labeled, this is a breeze. No matter where you are in your filter shopping journey, we’ve got you covered. Once you find your filter’s nominal size, you can shop any brand with confidence. Nominal sizing makes comparing similar products easier. Actual filter sizes vary by brand, which creates shopper confusion. You’ll likely see the nominal size printed on the side of your filter.įilter manufacturers use nominal sizing for industry consistency. Nominal size is a rounded estimate of an air filter’s actual size. To convert from actual to nominal size, measure your filter and round each dimension up to the nearest inch. If you measure your filter with a ruler, you’ll get the actual size.Īn air filter’s actual size is usually ¼ to ½ inch less than its nominal size. The actual size is an air filter’s exact size. See how nominal and actual sizing relate. If you know your filter’s nominal size, it will be a universal fit across any brand.
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This estimate is called the nominal size. Manufacturers label filters with an estimate of their actual size. If your filter has bent corners when you take it out, it’s too big.If you have to jam or force your filter into the slot, it’s too big.If you notice an uptick in dust around your home, your filter may be too small.If your filter makes rattling noises inside your system, it could be too small.
COMMON PC FAN SIZES PROFESSIONAL
If you’re still unsure, call an HVAC professional to confirm. Here are some clues that you need a filter swap. A filter that’s too big can damage the area, causing a safety hazard. A filter that’s too small leaves gaps for air and germs to escape. The wrong size HVAC air filter can compromise your whole system. Stop Reading, Start Talking Connect with an expert now! Signs your filter is the wrong size