Which way does the arrow point on an air filter?

Does it matter if air filter is backwards?

Although the two sides of an air filter might look the same, they are not. … By installing your filter backwards, air will have a harder time flowing through the filter and your air handler will have to work harder to make up for the loss of airflow.

What is the direction of air flow?

Air always flows from a high-pressure area to a low-pressure area, much like water running downhill. Therefore, without an effective barrier, air outside a home at a higher pressure will always attempt to enter the home.

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