They can always tell the way the filter should go in even without looking at the arrows.Īlthough not very common, you can still find air filters without an airflow arrow. The arrows on air filters are there to guide homeowners on the correct direction to install them but experienced HVAC technicians don’t need them. To tell them apart, you can feel a suction force if you place your palm on the return air grill (when the furnace is on) and is usually bigger in size than the supply air grill. Note: A house will have a return and a supply air vent grill. If the air filter is on the wall, the arrow on the filter should point towards the wall (again, away from you and out in direction of the air flow?.That is because that is the direction of air flow (from the house to the furnace via the return air duct). If the filter is located on the ceiling, the arrow on the filter should point towards the ceiling (away from you).That could at the bottom of the unit or on the side (usually left-hand side) depending on whether you have a vertical or horizontal HVAC unit respectively. If the filter is located next to the furnace or air handler, the airflow on the filter should point toward the furnace/air handler.Which Direction Does the Air Filter Arrow Point?ĭepending on where you air filter is located, it is very easy to figure out which way the air filter arrow should point. In short, the airflow direction is from the house to the return air duct to the furnace/air handler to the supply air duct and lastly back to the house. While the filter is mostly located just before where the return air ducts terminates to the furnace, it could also be located just behind the return air vent grill.Īfter the air has been cleaned, it is heated or cooled in the furnace/air handler and then sent back to the house via the supply ducts. The return air duct is the one responsible for carrying air from the house to the furnace. For that reason, the air filter is usually installed somewhere on the return air duct. The function of the air filter is to trap these impurities and therefore prevent them from clogging the furnace and importantly being circulated back to the house. As you already know, the indoor air contains dust, pollen, lint, dander animal fur among other impurities. When the furnace kicks in, the blower starts to pull air from the house. That forms a continuous loop but since the indoor air is bound to become stale, outdoor (ventilation) air is also introduced into the system.įor the sake of this, post, let us do away with ventilation air for now. In an HVAC system, air flows from the house to the furnace/air handler through the return air duct and back to the house through the supply duct after heating or cooling. How to Tell Which Way Air Flows in an HVAC Unit Regular replacement ensures that the filter continues to function effectively. Regular Replacement: To maintain good indoor air quality and HVAC system efficiency, replace the filter according to the manufacturer’s recommendations.A properly sized filter should fit snugly in the filter slot or housing, with no gaps that allow unfiltered air to bypass the filter. Filter Sizes: Ensure that you have the correct filter size for your HVAC system.It may also cause the filter to become dislodged during operation. Improper Installation: Installing the filter in the wrong direction, with the arrows facing away from the furnace, can disrupt airflow and reduce filtration efficiency.The solid edge is the upstream side (where the air enters), while the cardboard or mesh side is the downstream side (where the filtered air exits). Filter Frame: The frame of the filter usually has a solid edge and a cardboard or mesh side.In most HVAC systems, this means the arrows should face towards the furnace or air handler. Airflow Direction: The correct direction to install the filter is with the arrows pointing in the direction of the airflow.The arrows typically point towards the furnace or air handler and away from the return air duct. These arrows indicate the correct airflow direction. Follow the Arrows: Most furnace filters have directional arrows printed on the frame or edge. Here’s a summary of the correct direction to install a furnace filter: Installing a furnace filter correctly is essential for effective air filtration and the efficient operation of your HVAC (Heating, Ventilation, and Air Conditioning) system.
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