Which direction should the airflow arrow point on my air filter?

March, 9 2020
How air moves in a duct in your HVAC unit with an air filter.
Alex Kenitzer
Written By
Alex Kenitzer
Air Filter

How to install an air filter in your home the correct way.

Determining which way the airflow arrow points can be one of the biggest challenges when installing your air filter. An air filter installed incorrectly can obstruct airflow, increase strain on HVAC equipment, and cost you extra. 


The easiest method in determining which way the airflow arrow should point is to refer to the pre-existing filter before removing it and installing the new one in the same manner. If the old air filter has already been removed or it is the first time you are installing a filter in the system, use these tips as a guide.

Position the airflow arrow so that it points in the direction the air is flowing.


In addition to clean air, filters also protect your HVAC system from debris and dirt buildup. The airflow arrow should point towards the furnace/blower motor to collect harmful particles before it reaches the furnace’s equipment. 

You can also refer to your HVAC manual for exact filter locations and installation instructions if available.

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