Which way does reusable air filter go?

Which side of air filter goes up?

If your filter is on the ceiling, the arrow should face the ceiling. If your filter is on the wall, the arrow should face the wall.

What happens if I put my air filter in backwards?

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. This could lead to higher utility bills and possibly damage your furnace or air conditioner.

Does the arrow go up or down on an air filter?

The arrow on the filter should always point toward the furnace. The furnace or the filter air box most likely will contain the correct filter measurements for replacement filters or just check the filter itself.

How do I know which way the airflow is on my furnace?

If you are looking at a furnace filter, find the arrow that indicates the proper air flow direction. That arrow must always face toward the furnace and away from the return duct that carries the air in need of heating or cooling.

What is the direction of air flow?

Air flows forward, and it gets pushed around by whatever is in its way. Air always flows from the high pressure region to the low pressure region. A warmer place is usually a low pressure region while a colder place is a high pressure region. Thus the direction of air is from warmer to colder region.

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