Air 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 an estimate from the manufacturer, usually printed on the side of the filter. This nominal size creates consistency across the board, making it easy to compare different filter models.
All filters have two different sizes: a real size and a nominal size. The actual size is the exact dimensions without rounding, while the nominal size is the rounded dimensions of the filter. For example, a filter may be labeled “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.
It's important to round up to the nearest inch to create the nominal filter size when purchasing a filter. When replacing an air filter, you can 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 their services. 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 they'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 your 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 your 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.
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.