Remove the old air filter from your furnace. On your new air filter, find the arrow that indicates the proper air flow direction. This tends to confuse everyone more than anything else. That arrow must always face toward the furnace and away from the return duct that carries the air in need of heating or cooling.Click to see full answer. Correspondingly, which way does air filter go?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.Beside above, what happens if you put the AC 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. Similarly one may ask, what happens if you put an air filter in backwards? If you put your filter in backwards, the usually collective end of the device will not face the air supply. Your filter will aid in keeping debris in the air. This results in a clogged filter and inaccurately cleaned air getting into your lungs.How often should air filters be changed?Here are averages that might help you know how often you should change the air filter at home: Vacation home or single occupant and no pets or allergies: every 6-12 months. “Average” suburban home without pets: every 90 days. Add a dog or cat: every 60 days.
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