Does it matter which side of the 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.

Does it matter what direction air filter goes?

The arrow must face toward the furnace and away from the return duct that pulls the air in need of heating or cooling. It’s smart to draw the airflow direction arrow with a permanent marker on the furnace or ductwork. … The arrow on the filter should always point toward the furnace.

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.

Which side of HEPA filter faces out?

The side that feels smoother is the side where dirty air enters. On this side, there are a lot of fluffy hairs used to capture the pollutant particles. The rougher side is where clean air blows out. The side to be installed is indicated on the Smart Air filters so just follow what is said.

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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