What Are the Different Sizes of Air Filters?

Air filters come in a variety of sizes, and it's important to know which size is right for your HVAC system. Labels on air filters typically include three dimensions: length, width, and thickness or depth. The easiest way to identify the size of the AC filter is to remove the existing filter from its slot and examine the filter frame. Typically, the filter size is printed along the edge of the filter frame.

Note that the size shown in bold type on the filter frame is the nominal size of the filter, which is likely to differ from its actual size. If the actual dimensions do not appear in small print on the filter frame, we recommend measuring the filter for double checking. It's important to make sure you have the right size air filter for your HVAC system. Installing several 1-in-a-slot air filters, for example, can cause costly damage to your air conditioning unit, as residential ovens are not equipped to handle this level of airflow restriction. If the filter fits perfectly, use the numbers on the sides to choose a replacement every 60 days, or as recommended by the manufacturer.

If your HVAC system uses a whole-house filter (they are close to your central oven or air conditioning unit), the model number will most likely appear, not the dimensions. But if your system needs custom-sized air filters, keep in mind that we offer custom sizes ranging from 8 x 24 x 1 to 25 x 30 x 1.To convert the actual size to the nominal size, measure your filter and round each dimension to the nearest inch. 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. There are several great options to buy air filters online and have them delivered conveniently to your door.

The list of location HEPA filters for sale usually includes compatible models in the description or in the bullet points, so be sure to check for compatibility to ensure you buy the right HEPA filter for your air purifier. Airflow in the wrong direction of a filter can create greater resistance and cause strain on the system. That's why it's important to make sure you have an air filter that fits correctly and is designed for your HVAC system. With a little research and knowledge about air filters sizes, you can make sure you get an air filter that fits perfectly and keeps your HVAC system running smoothly.