When it comes to keeping your home's air clean and healthy, the right size air filter is essential. The size of the filter you need depends on the dimensions of your HVAC unit, and it's important to get the right size to ensure optimal performance. In this article, we'll explain how to measure your air filter and find the right size for your home. The filters used in HVAC systems 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.
To measure your air filter, you'll need to take note of both the length and width (L x W). If the filter is not square, the smallest measurement goes first. Once you have the measurements, you can choose a replacement air filter that's perfect for your home. If you're having trouble finding the right size, you may be able to find the proper dimensions of the air cleaner in your HVAC manual.
It's important to get the right size filter because if there is any resistance to airflow caused by an ill-fitting filter, it can cause unnecessary stress on the HVAC unit itself, which could damage the system equipment and increase your energy bills. If you're still having trouble finding the right size air filter for your home, watch this video for step-by-step instructions on how to find the actual dimensions and obtain the nominal size of your system: https://www.youtube.com/watch?v=Xyf_3Kjh6zQIf the dimensions are too faded to read or there is no air filter to look at, it's time to use the DIY method. Measure It Yourself: Take a tape measure and measure both the length and width of your HVAC unit's air cleaner compartment. Filters don't need to fit a “tight seal”, but you should be able to easily install and uninstall the filter effortlessly. However, it has to fit snugly into the air cleaner compartment with a little space around the edges. Most air conditioning and HVAC units use standard-size filters, but some require the purchase and installation of a custom-sized air filter.
Filters should be changed every 30 to 90 days, depending on the type and efficiency of the filter. By using a properly sized filter and changing it regularly, you can experience cleaner indoor air and fewer system problems. However, these filters can sometimes restrict airflow, which can lead to air and system quality problems. Keep in mind that some HVAC systems require more than one air filter, so make sure you have the correct measurements for all of them. If the filter is too small, it will loosen and some of the air (and dirt) will not pass through the air filter.