In most cases, you can use the closest standard size for your air filter. Keep in mind that the air cleaner slot will be the actual size of the air cleaner, so the filter slot will be slightly smaller than the size of the air filter you need to buy. For example, if your heating unit is FG7SA-045C-23A, you may be able to find a standard size that fits. Not only can you save money by choosing a standard size, but changing air filters regularly can also help prevent premature oven failure. To determine the size of filter required by a heating and cooling system, you can either look at the old filter or consult the owner's manual.
Once you understand that the nominal size is not an exact measurement, but rather a rounded number that makes it easier to search for and package air filters, you can figure out how it differs from the actual size. If the filter is too large, it won't fit into the filter slot and you won't be able to replace the cover. It's important to understand what nominal size means when buying an air filter. The MERV air filter rating is a measure of how effective an air filter is at removing particles from the air. This number is then rounded up and used to label air filter packs; this measurement is called Nominal Size.
With so many different sizes of AC filters available, it can be difficult to know which one you need. Once you know the size of your old air filter, you can easily buy a new one with the same dimensions. Remember that nominal size is not the same as actual size. A higher MERV rating means that an air filter is more effective at removing smaller particles from the air. If your oven is missing its air filter and you don't know what size it should be, you'll need to measure it. When it's time to change your HVAC system's air filter, make sure you order the right size.
If an air filter is too small, this will create gaps in which contaminants can pass through without being filtered out. Choosing the right filter size may seem simple, but there are some common mistakes that can be tricky to avoid. Since air filters are usually sold according to their nominal dimensions, it's essential to learn how to measure your air filter correctly.