Are air filters all the same size?

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. The nominal size is only an estimate from the manufacturer. Usually, this number is shown on the side of the filter.

The nominal size is a rounded estimate, which is used for consistency. In the production process, not all filters will have the exact same size. If the manufacturer measures the actual size, the variation in the numbers could confuse buyers. This nominal size creates consistency across the board, adding peace of mind and less confusion for consumers.

This also makes it easy to compare different filter models. All filters have two different sizes. All filters have a real size and then a nominal size. The actual size is the exact dimensions without rounding, while the nominal size is the rounded dimensions of the filter.

This means that in 1 and 2 air filters, the nominal size does not include the bottom cut and the actual size does include the bottom cut. In whole-house filters, the nominal size is the rounded size, and the actual size is only the non-rounded one. Most air filters have their size printed on the side of the frame. The length, width and depth of the filter are measured in inches.

For example, it will say something like “16x25x1", where 16 is the length, 25 is the width, and 1 is the depth. If the filter is too small, it will loosen and some of the air (and debris) will not pass through the air filter. Rensa Filtration is a family of air filtration companies that manufacture and market best-in-class solutions that keep people safe and industries thriving. There are a number of great options to buy air filters online and have them delivered to your doorstep comfortably.

Round up to the nearest inch to create the nominal filter size, which is the measurement you will use when purchasing a filter. If the filter fits perfectly, use the numbers on the side to choose a replacement every 60 days, or as recommended by the manufacturer. However, they usually add an additional surcharge to the filter to compensate for the services they provide. From filtering out harmful contaminants to keeping your HVAC unit running efficiently, these products have several advantages.

If you can't find it in the filter, you can provide Second Nature with the nominal size and brand you used previously, and we'll be able to find the filter you're looking for. If that doesn't work, you may be able to find the appropriate air filter dimensions in the HVAC manual. The goal is for the filter to slide into the frame comfortably with a little room for maneuver, but not too much. Installing several air cleaners 1 in a slot of 2, for example, can cause costly damage to the air conditioning unit, since residential furnaces are not equipped to withstand this level of airflow restriction.

If you're looking for a retailer near you that sells custom-sized air filters, you might be struggling to get lucky.

Robert Smisek
Robert Smisek

Total twitter nerd. Typical food trailblazer. Avid food practitioner. Unapologetic web junkie. Freelance twitter evangelist. Passionate food advocate.

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