Installing an air filter correctly is essential for ensuring that your home's air conditioning system is running efficiently and that the air you breathe is clean. Air filters have arrows printed on the sides that indicate in which direction they should be installed. These arrows should always point in the direction of the air flow, away from the supply ducts and towards the fan. When installing a new air filter in the return duct of the air conditioner, the arrows should point inward to show the direction of the air flow.
This is because your home's return duct is drawing in air. Fortunately, most air filters are designed to not fit properly unless inserted correctly. Look for the airflow arrows printed on the side of the air filter that indicate in which direction it should be inserted. It is important to always disconnect the boiler power supply before installing a new air filter, as they can accumulate a lot of dust.
Dirty air filters also force the HVAC system to work longer than necessary, reducing equipment life and increasing your energy bills. Unfiltered air will always choose the path of least resistance, making the filter useless. When air filters become clogged with dust, dirt and debris, they can no longer do their job of improving indoor air quality. Determining which direction the arrow points in can be one of the biggest challenges when installing an air filter.
No matter what type of air conditioning system you have, each unit needs a quality filter that is properly adjusted to keep indoor air quality clean and your unit operating at peak efficiency. An improperly installed air filter can obstruct airflow, increase pressure on HVAC equipment, and cost you more. Changing the air filters in your home may seem like an easy task; however, it is something that is easily forgotten. Make sure to check your filters regularly and replace them when necessary to ensure that your home's air quality remains clean and healthy.