How Do I Know What Size Air Filter I Need

First let s determine the length.

In most hvac systems you can find the air filter in the return air duct. If the air filter isn t a square this will be your smallest measurement. If you re still not sure what size filter s your home needs feel free to reach out to us. If you do not have an old filter to figure out the measurements from then you can measure the dimensions of the filter holder in your hvac equipment.

It is recommended that you change your refrigerator water filter every 6 months. You want your air filter to cover the duct opening. Note the position of the vacuum gauge needle when the engine is switched off. The final measurement we ll need is the depth.

A filter should be sized 1 1 2 to 2 times larger than normal for any conditions that could be considered severe. This is the thickness of the air filter. Air filter size calculator other methods a vacuum gauge can help identify a filter that is too small. Unlike air filters you can t easily tell when they need to be changed.

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In this case the e 1500 used in our example should be replaced by an e 1120 or an e 1150. Merv filter ratings and efficiency. Look for a grill or box cover on a wall near the furnace or in some cases inside or on the air handler itself. For most refrigerators the change filter light is usually set to a timer.

Off road conditions require additional filter surface area. That pesky change filter light is an all too familiar sight for many of us. When you are at high maximum rpm and full throttle you want to see the needle in the exact same position. Merv 17 through merv 20 filters are typically used in surgical operating rooms clean rooms and other contexts that require absolute cleanliness.

Now we ll list all the measurements length by width by depth. In general filters with a rating of merv 16 or below are considered to be hvac system grade filters for residential commercial and general hospital use. Just because your refrigerator s water filter light is on may not mean it s time to. Now let s measure the width.

Most air filters have their dimensions printed right on them. The size of your pleated air filter is always presented in a string of three numbers with the first number representing the length the second number representing the width and the last number representing the thickness. Look inside the section of the furnace where the air filter should go there should be a 1 filter track or opening where the air filter slides into. To do so you will need a flashlight and a stiff tape measure.

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The size efficiency and type of air filter your system needs depend on your system. In using the cadr rating to determine whether an air purifier can clean the size of your room is pretty straightforward using the table above. The size of your air filter can be determined by looking at the old air filter in your hvac system. Then multiply the two numbers to get the square footage.