Finding the right size air filter for your air conditioning system can be a daunting task, but it doesn't have to be. As an expert in the field, I can help you make an informed decision when buying an air filter online. 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. It's important to understand that there are two sizes associated with an air filter: the nominal size (which is a round size often used to label the filter) and the actual size. The width of an air filter is usually the longest side, and while the height is usually the shortest side, the size of the length comes second. To ensure that you buy the right size air filter for your system, you must measure the interior dimensions of the air filter inlet.
If the filter is too small or too large, air will flow around it instead of through it and not all of the air will be filtered. If it's too large, it won't fit in the filter slot and you won't be able to replace the cap. You can choose from filters that are already in stock if your air filter size is available. Alternatively, 4, 5, or 6-inch air filters are found in whole-house filters that are installed in an air controller. Plus, they come in more than 30 different sizes. To get a good deal on your purchase, I recommend that you start looking for a replacement air filter by limiting yourself to the depth of the air filter.
Additionally, look for discounts and free shipping offers. Buying an air filter doesn't have to be overwhelming if you know what to look for. By understanding nominal and actual sizes as well as relationships between suppliers, you can make an informed decision when purchasing an air filter online.