If you set your filter up backwards, the normally collective end of the device will not face the air supply. In effect, your filter will help keep debris in the air. This results in a clogged filter and improperly cleaned air when it reaches your lungs.
Does HVAC filter direction matter?
HVAC filter direction matters because air flows through it in one direction. While its two sides look the same, one is more porous to allow air to get inside. Otherwise, air can’t pass, and the unit itself must work harder and longer, leading to higher energy consumption and efficiency loss.
Why do air filters have a direction?
This allows the filter to effectively trap airborne particles while also minimizing the slowdown of airflow through your system. 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.
Are air filters directional?
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.
