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.Click to see full answer. Regarding this, what happens…

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.Click to see full answer. Regarding this, what happens if you put an 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. That arrow must always face toward the furnace and away from the return duct that carries the air in need of heating or cooling.Also Know, is there a wrong way to put in an air filter? 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. Also to know is, which way does air filter go in? Luckily, most filters are made so they won’t fit right unless they’re inserted in the correct direction. There should be airflow arrows printed on the side of the air filter to indicate what direction the filter should be inserted. When you insert your new filter, the arrow should 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.

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