Direction of air flow furnace12/7/2023 From the outside to the furnace through ventilation vent.From the house to the outside through the exhaust vent.From the house to the furnace through the return duct.In an HVAC system, this is how air flows: So, how can you tell which way air flows in a furnace or AC unit? When you find out how, you will automatically know which way an air filter goes in a furnace. It will not even take you five minutes and you therefore don’t need to hire an HVAC technician to do it for you. The good thing is that changing a furnace filter is so easy. ![]() Most folks prefer drawing a small arrow (with a permanent maker pen) near the furnace to show the direction of airflow (and therefore which way to put the filter) but in my opinion that is not necessary.Īs long as you know which duct is the return and which is supply and importantly where they connect to the furnace, you automatically know which way to put in the furnace filter. ![]() However, the filter can be changed sooner or long after 3 months depending on its size (thickness), MERV rating, number of people and pets in the house, health condition of the people living in the house among other factors. Ideally, a furnace filter should be changed after 90 days (3 months). That is also the reason why these filters should be changed regularly. The furnace filter should make it easy for the blower to pull air from the house and not create a restriction. Therefore, when installing/changing a furnace filter, make sure that the airflow arrow is pointing towards the furnace and away from the return duct. The furnace filter must be installed in accordance with the direction of airflow in the furnace.Īir flows from the house to the furnace through the return duct and after heating/cooling it flows back to the house through the supply duct. ![]() Understanding the direction of airflow of your furnace is vital when changing the furnace filter. The furnace also pulls outdoor air which is mixed with return (indoor air) for ventilation purposes. A furnace has a blower which pulls air from the house, pushes it to the heat exchanger and later sends it back to the house after heating.
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