Which Direction Should My Furnace Filter Face?

Changing your HVAC filter may seem like a simple task, but a lot of homeowners don’t realize that there is a right way and a wrong way to do it. We’ve put together some furnace filter tips, including which direction to install them, to help you keep your heating and cooling system running at its very best.

How Often Should I Change My Filter?

First of all, it’s important to change your filter regularly. If you don’t, it’ll negatively affect your heating system’s performance and efficiency, as well as your indoor air quality. Depending on the filter type, you should change it every 1-3 months. We recommend you replace it at least every 90 days. However, the frequency really depends on how many occupants and pets you have in your home. Just make sure when you replace your filter that you’re installing the new one in the proper direction, which we explain below.

How to Change a Furnace Filter Correctly

Furnace filters aren’t overly expensive, but you want to make sure you’re getting the most out of them and your furnace, and that starts with installing them in the right direction.

1. Locate the Filter

If you don’t already know where your filter is located, take a moment to find it. They are usually installed on the side of your furnace, where the unit meets the ductwork.

2. Remove & Throw Away Old Filter

Pull the old filter out and throw it away. We recommended wearing a dust mask when doing this. Make sure you handle the old filter carefully, so you don’t disturb the dust and debris and breathe it in.

3. Find the Arrows

Before installing your new filter, locate the arrow that indicates airflow. The arrow should face toward your furnace and away from the air duct that supplies your unit with air. You can mark the direction of the airflow on your ducts with a marker. That way, the next time you replace your furnace filter, you can just point the arrow on the filter in the same direction. We also recommend writing the date of installation on your new filter so you can keep track of when you changed it.

4. Confirm the Filter Fits

Your old filter should have the correct measurements on it, so double-check that your new one is the same size.

5. Insert New Filter According to Arrows

Install the new filter by sliding it in with the arrow pointing towards the furnace.

*Now that you know how to install your furnace filter in the right direction, it’s a good idea to have one or two extra filters on hand so you can replace them as needed.

Call Fahrhall for Help & Maintenance

Whether you’re in need of filters, extra help changing your filter, or any kind of HVAC maintenance, repair or installation services, you can call Fahrhall. If you’ve recently changed your furnace filter but find your system isn’t working like it used to, it may be time for service or an upgrade. 

For all your indoor air quality and HVAC service needs, call Fahrhall.

Fahrhall has been proudly serving the Windsor-Essex and Chatham-Kent regions since 1967. We are committed to providing our customers and our community with reliable service and quality equipment.

Did you know that we’re on Facebook & Instagram? We post tips to help you improve your home comfort.