Which way does the air flow through my furnace?

Question

Below is my furnace and I need to change the filter however I am unsure which way is the airflow direction. Red or Blue?

enter image description here

Remember that the air needs to be filtered BEFORE it enters the air handler and furnace. — longneck, Mar 11, 2014 at 12:51

Chris O · Accepted Answer · 2023-04-24 16:26:13Z

8

In your diagram, the correct direction is the red arrow.

For more information, here's a diagram that shows the airflow in a furnace:

Chris O

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answered Mar 10, 2014 at 18:26

A O

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