You need to find the filter size that fits your air return. This size will be the nominal size, meaning it is rounded off its actual size. To start, turn off the oven and remove the filter from the existing oven, which will be inside the oven or inside the return air outlet. Look for an arrow on the filter that indicates the direction of air flow and draw it on the outside of the oven with a permanent marker.
Then, look at the size of the oven filter, which will be printed on the cardboard frame. Measure the length and width (L x W). If the filter is not a square, the smallest measurement comes first). You can find the part number or size on the side of the filter.
Filters are measured by nominal size, which is a rounded number that varies by brand, so many filters have the part number of each brand they are compatible with. When choosing an air filter, you should consider what kind of filter you have and what type of particles you want to block. Pleated filters are best for moderate to high MERV ratings and capture smaller particles and allergens. If energy efficiency is a higher priority for you, then a lower MERV filter will work, as it will prevent larger particles from entering your system without reducing airflow.
Buying bulk air filters online can save you a significant amount when you decide to buy your HVAC filters online. 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. The most common sizes of AC filter and oven filters are air filter 16x20x1, air filter 20x20x1, air filter 16x25x1 and oven filter 20x25x1. When installing an air filter, make sure it fits snugly into the air filter compartment with a little space around the edges. Some HVAC systems aren't strong enough to push air through more restrictive filters that block smaller particles, i.e.
those with a higher MERV or CADR rating, which can reduce airflow and cause your home to heat and cool less efficiently. You can proactively clean the air and surfaces in your home by adding an air purifier in the duct that creates supercharged particles. Choosing and installing an air filter for your home doesn't have to be complicated if you know what type of particles you want to block and what size fits your system. Make sure to buy from a reputable source such as a large store or aftermarket manufacturer such as FilterBuy that offers additional features such as odor blocking, higher MERV ratings, and easier to replace designs.