The arrow must face toward the furnace and away from the return duct that pulls the air in need of heating or cooling. … Replacing your air filter is not difficult. Remember that air flows from your ducts, through the filter, and into the furnace. The arrow on the filter should always point toward the furnace.
What happens if you put a furnace 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.
Which way does the air filter go in?
Make the arrows face the ceiling or wall. 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 the arrow point up or down on an air filter?
For any air filter, whether it be for an air conditioner or a furnace, the ARROWS ALWAYS POINT IN THE DIRECTION OF AIR FLOW. When you install a new air filter into the AC return duct, the arrows face inward to specify which way the air is flowing.
Why do air filters have a direction?
Air filters have arrows printed on the sides of them that show you which way they are supposed to be installed. These arrows should be pointing in the direction that air flows through your system, which is away from the supply ducts and (typically) toward the blower.
When replacing pleated filters describe the correct orientation of the filter?
With most pleated filters, the direction of air flow is critical . The dirt should not be accumulating on the metal mesh side of the media; if that is happening, you put it in wrong. Switch it. The mesh side is the back side ; the air should flow through the front side first.