What Size Furnace Filter Do I Need

The most typical sizes for a furnace filter are 16 x 20 20 x 25 and 16 x 25 however many other sizes are available for purchase on our site.

What size furnace filter do i need. We get this question a lot and it s an important one. One thing you ll want to be aware of is that the actual size of your filter will vary slightly from what s printed on it sometimes by as much as a half an inch smaller for each dimension. If you have any questions about the size you need you can refer to the owner s manual for your furnace or air handler or contact your local lennox dealer. Most furnaces are offered in 15 000 20 000 btu increments so you just need to get close in terms of sizing.

The size on the filter is usually expressed in inches example. Posted on november 30 2018 by rick welter. Calculate the square footage of your home add up the areas of all the rooms in your home you would like to heat. Here are the first two steps you should take to estimate furnace size.

Like a popular meme or television show might tell you. The owner s manual for your furnace should tell you what size you need. Note the size printed on the air filter frame if you removed an old filter check its size so you can be sure you have the correct filter for replacement. The chart is a furnace filter size finder just click on the filter sizes and you will see purchase options.

A filter that is the wrong size will typically not fit or may not stay in place once installed. Furnace filters come in a range of sizes and different brands and types of furnaces use different filters. As you know estimating the size of your furnace heating system involves considering a variety of factors. For example your filter might read 16 x20 x1 but if you measured with a ruler it might be something like 15 1 2 x19 3 4 x3 4.

And if you re in need of a new furnace now is the time to act. If the furnace you selected is more than 10 below your heating requirement we suggest you go up to the next size. How to calculate the right size furnace. What size furnace do you need.

Because if you buy an hvac system that s too big you ll end up wasting money and energy. What size air conditioner or furnace do i need for my home. The size of your filter will be located on the side of the door on your filter cabinet. The filter must fit snuggly in your furnace.

And if it s too small you won t get enough cool or warm air flowing through your home. The most common ac filter sizes and furnace filter sizes are the 16x20x1 air filter 20x20x1 air filter the 16x25x1 air filter and the 20x25x1 air filter. But the average homeowner can t simply go out and buy just any furnace. 3 easy steps for sizing your home s furnace.