Where Is The Air Filter In My Furnace?

Lincoln HVAC Reasons Your Furnace Filter Isn't Doing Its Job
Lincoln HVAC Reasons Your Furnace Filter Isn't Doing Its Job from bryantlincoln.com

Where is the Air Filter in My Furnace? – 2023 Article


If you own a furnace, it’s important to know where the air filter is located. The air filter plays a crucial role in maintaining the air quality in your home and keeping your furnace running efficiently. In this article, we will discuss the importance of the air filter and guide you on where to find it in your furnace.

Why is the Air Filter Important?

The air filter in your furnace helps to remove dust, dirt, and other particles from the air before it is circulated throughout your home. This not only improves the air quality but also prevents these particles from clogging the furnace components. A clean air filter allows for better airflow, which ensures that your furnace operates at its optimal level and reduces energy consumption.

Finding the Air Filter

The location of the air filter can vary depending on the type and model of your furnace. However, there are a few common places where you can typically find it:

1. Behind the Return Air Grille

For many furnaces, the air filter is located behind the return air grille. This grille is usually located on a wall or ceiling and is responsible for drawing in the air from your home. To access the air filter, you will need to remove the screws or clips that hold the grille in place. Once removed, you should be able to see the air filter behind it.

2. Inside the Furnace Cabinet

In some cases, the air filter may be located inside the furnace cabinet. To access it, you will need to open the cabinet door. The air filter is typically located near the blower motor or the return air duct. Look for a slot or a compartment where the air filter can be inserted.

3. In a Filter Housing

Certain furnaces have a separate filter housing, which is usually located near the furnace. The filter housing is designed to hold the air filter and may have a removable door or panel. Check around the furnace area to locate the filter housing, and then open it to access the air filter.

How to Replace the Air Filter

Once you have located the air filter, it’s important to check its condition regularly and replace it when necessary. A dirty or clogged air filter can restrict airflow and reduce the efficiency of your furnace. Here’s how you can replace the air filter:

1. Turn off the Furnace

Before you begin, make sure to turn off the furnace to avoid any accidents or injuries.

2. Remove the Old Filter

Take out the old air filter by sliding it out of its compartment or removing it from the filter housing. Be careful not to damage or bend the filter.

3. Install the New Filter

Insert the new air filter into the compartment or housing, making sure it is properly seated. Pay attention to the direction of the airflow arrows indicated on the filter, as this will ensure it is installed correctly.

4. Close the Compartment or Housing

Once the new filter is in place, close the compartment door or panel securely.

5. Turn on the Furnace

Finally, turn on the furnace and check for proper airflow. If the new filter is installed correctly, you should notice improved air quality and better furnace performance.


Knowing where the air filter is located in your furnace is essential for proper maintenance and optimal performance. By regularly checking and replacing the air filter, you can ensure better air quality and extend the lifespan of your furnace. Refer to your furnace’s manual or consult a professional if you have any doubts or difficulties in locating or replacing the air filter.