Question: Does it matter if furnace filter is backwards?

Which way does arrow point on furnace filter?

The arrow points in the direction of the airflow. The point should go toward the inside of the furnace compartment. If the filter goes inside the ductwork, it should point toward the air handler or the furnace.

What if my air filter has no arrow?

If it does not have an arrow though, you’ll want the side with the wire-frame to be facing outward. This means the side with the wire-frame will be on the outside, or the side closest to you, and the side without it will be inside closer to the unit.

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