How Do I Know What Size Air Filter I Need

If you re still not sure what size filter s your home needs feel free to reach out to us.

It is recommended that you change your refrigerator water filter every 6 months. Just because your refrigerator s water filter light is on may not mean it s time to. Off road conditions require additional filter surface area. 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.

Then multiply the two numbers to get the square footage. The size of your air filter can be determined by looking at the old air filter in your hvac system. 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. Note the position of the vacuum gauge needle when the engine is switched off.

The size efficiency and type of air filter your system needs depend on your system. 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. In most hvac systems you can find the air filter in the return air duct.

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The air filter size should be exactly the same size as the frame around that opening or incrementally smaller. Now we ll list all the measurements length by width by depth. Merv 17 through merv 20 filters are typically used in surgical operating rooms clean rooms and other contexts that require absolute cleanliness. If the air filter isn t a square this will be your smallest measurement.

Look for a grill or box cover on a wall near the furnace or in some cases inside or on the air handler itself. In this case the e 1500 used in our example should be replaced by an e 1120 or an e 1150. Of course to calculate square footage you measure the length and width of your room in feet. That pesky change filter light is an all too familiar sight for many of us.

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. This is the actual filter size and true dimensions. 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. 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.

When you are at high maximum rpm and full throttle you want to see the needle in the exact same position. This is the thickness of the air filter. First let s determine the length. Now let s measure the width.

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You want your air filter to cover the duct opening. A filter should be sized 1 1 2 to 2 times larger than normal for any conditions that could be considered severe. Most air filters have their dimensions printed right on them. Merv filter ratings and efficiency.