Which Way Should an Air Filter for AC Go?

HVAC systems are responsible for circulating air throughout the house, expelling hot or cold air and extracting spent air. To ensure that the system works efficiently, it is important to install the air filter correctly. Most air filters have arrows printed on the sides that indicate the direction in which the air should flow. The arrows should point away from the supply ducts and towards the blower.

If the filter is in the ceiling, the arrow should face the ceiling, and if it is on the wall, it should face the wall. When installing a new air cleaner in the AC return duct, the arrows should point inward to show that air is being drawn in or sucked in. It is important to note that if air flows through the filter before entering the HVAC system, then the arrow should point towards the blower. Additionally, metal is often used as a support behind the filter media to maintain its rigidity as air passes through it.

It is also important to routinely monitor your air filters to prevent them from becoming clogged with dirt, dust, or debris. A clue that tells you when it's time to replace filters is when you can no longer see through them. If you install a smaller air filter, dust and dirt particles will travel around it and go directly to the air conditioning unit. If you install it in the wrong direction, air will struggle to flow through it and your air handler will have to work overtime to compensate for this loss of airflow.

If your air cleaner does not have an airflow arrow, make sure that the wire mesh faces the blower of your HVAC system, as this is the last surface that touches the air. When removing an old filter, be careful as it has probably accumulated quite a lot of dust and other particles. To ensure that your HVAC system works efficiently and effectively, it is important to install your air filter correctly. Look for arrows printed on its side that indicate which direction it should be inserted in.

When installing a new filter in an AC return duct, make sure that the arrows point inward to show that air is being drawn in or sucked in. Additionally, if your filter does not have an airflow arrow, make sure that its wire mesh faces towards the blower of your HVAC system.

Glenda Domio
Glenda Domio

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