Air filters come in a variety of sizes, types, and qualities. To determine the size of an air filter, you need to measure it with a tape measure. The actual size of an air filter is usually ¼ to ½ inch smaller than its nominal size. To convert actual to nominal size, round each dimension to the nearest inch.
All filters have two different sizes: the real size and the nominal size. The actual size is the exact dimensions without rounding, while the nominal size is the rounded dimensions of the filter. In whole-house filters, the nominal size is the rounded size, and the actual size is only the non-rounded one. It is important to note that there is no need for an airtight seal between the frame and the air filter. Additionally, suppliers may be encouraged to sell certain types or brands of air filters.
Therefore, it is necessary for those who need a whole house filter to know the exact filter size they need. To determine the nominal air filter size, round down to the nearest whole number. HVAC service companies typically offer air filter replacement services in addition to system repair and unit installation services. The length, width and depth of a filter are printed in small quantities along the filter frame on the cardboard border of a Filter King brand filter. These numbers refer to the standard size of your home's return ventilation grilles, responsible for controlling the movement of air to and from your HVAC unit.
Most air conditioning and HVAC units use standard size filters, but some require custom-sized air filters. When it comes to air filters, there are many factors to consider. From sizes to types, qualities and more, it's important to understand all aspects of air filters before making a purchase or installation decision. Knowing what type of filter you need and what size it should be will help ensure that your HVAC system runs efficiently and effectively.