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Furnace Filter FAQ: Which Way Does the Air Flow Arrow Go?

By May 11, 2020November 29th, 2020No Comments

When changing out your furnace filter for a new one, do you ever wonder if you are installing it the correct way? Did you know there is a correct way to install your air filter? Believe it or not, there is a right way and a wrong way to change your furnace filter.

In most cases, you should have one air filter for each level of your house. Finding where you air filters are is extremely important. Sometimes they can be in the ceiling or in the wall.

After you’ve located where your filters are, you’ll need to find the size you need and figure out which MERV rating best fits your needs. Need help? Check out these blogs for help:

Once you’ve figured the size and MERV rating out, it’s time to get ready to change your furnace filter. Here’s a quick video on how to safely change your air filter:

Don’t forget! Turn off you HVAC system while you are changing your air filter.

If you inspect your new air filter, you may see an arrow that says, “Air Flow”. Here’s an example:

When changing furnace filters many people wonder where the arrow of the filter should point towards. The arrow should always point in the direction the air is flowing. But sometimes, you may not know which way the air is flowing.

Here’s an easy way to figure out which way the air flow arrow goes: The arrow should ALWAYS point towards the return. The pleated part of the filter should be facing you when you install it and the other side, which usually consists of a metal mesh or cardboard frame should be pointed towards the return.

Once you’ve properly installed your filter, you can close the metal grille grate and turn your HVAC system back on.

Have a question about furnace filter installation? Drop in the comments below. is a replacement water and air filter company located in the United States. The views and opinions contained herein are solely those of the original author and do not represent Eco Blue Life or its affiliates. This article was originally published on  
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