Stick your hand or piece of paper into the filter opening to determine the airflow direction. To determine the airflow direction, if you don’t have an arrow indicating it, turn off your furnace (put the thermostat to “off”), turn the fan option from “auto” to “on,” then remove your filter. If you can’t find an arrow on your furnace, look harder or determine the direction with your hand or a piece of paper. So, if it is pointing to the left, that means the air is moving from the right to the left. The arrows point in the direction of the airflow. Usually, furnaces have multiple arrows stamped into the metal near the filter housing. To determine the airflow direction in your furnace, all you have to do is look for an arrow on the side of it. Which Way Does the Airflow in My Furnace? If the heat can’t escape into your home, it overheats the furnace and leads to short cycling. Info: When a backward filter blocks enough airflow, it will trap lots of heat inside the furnace. It usually doesn’t cause any lasting damage to your furnace, so you shouldn’t worry about it after correcting the filter orientation. Short cycling is a safety feature it shuts off the furnace to prevent damage from overheating. Your furnace is shutting off before reaching your thermostat’s setpoint ( short cycling).If you’re feeling chilled after replacing your furnace filter, you will notice that your furnace is running more than usual.So, how do you know if you’ve put your furnace filter in backward? It will reduce airflow, which puts strain on the HVAC equipment, dramatically reduces efficiency, and increases heating costs. If you put your HVAC filter in backward, there is a slight chance you will harm your furnace. What Happens if You Put Your Furnace Filter in Backwards? Info: All furnaces have arrows indicating the airflow direction. So, when installing your new filter, make sure the filter’s arrows are pointing in the same direction as the arrows on your gas furnace, as shown in the image above. The airflow direction of your air handler is also indicated with arrows on the outside of the filter housing. You should always install the filter with the arrows pointing in the airflow direction. All furnace filters (or HVAC air filters) have arrows around the edge that point in the airflow’s direction in your air handler.
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