Old Furnace Filter Location: A Guide For 2023

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As we enter the year 2023, it’s important to be familiar with the key aspects of maintaining your old furnace. One crucial element of furnace maintenance is knowing the location of the filter. In this article, we will provide you with a comprehensive guide on the old furnace filter location, enabling you to keep your system running efficiently.

Why is the Furnace Filter Important?

The furnace filter plays a vital role in maintaining indoor air quality and ensuring the proper functioning of your heating system. It traps dust, dirt, allergens, and other particles, preventing them from circulating in your home. A clogged or dirty filter can lead to reduced airflow, decreased efficiency, and even potential damage to your furnace.

Locating the Filter

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

1. Behind the Return Air Grille

In many homes, the return air grille is located on a wall or ceiling. Behind this grille, you will often find the furnace filter. To access it, you may need to remove the grille by unscrewing or unlatching it. Once removed, you can easily slide out the old filter and replace it with a new one.

2. Inside the Furnace Cabinet

In some furnace models, the filter is situated inside the furnace cabinet itself. To locate it, you’ll need to open the cabinet door. Look for a slot or compartment where the filter is housed. Remember to turn off the furnace before attempting to remove or replace the filter to ensure safety.

3. Near the Air Handler

If you have a forced-air system, the air handler is responsible for distributing conditioned air throughout your home. The filter is often located near the air handler, either within or adjacent to the unit. Consult your furnace’s manual or contact a professional if you’re having trouble finding it.

How to Replace the Filter

Once you’ve located the old filter, it’s time to replace it. Here’s a step-by-step guide to help you:

1. Purchase the Right Filter

Before replacing the filter, ensure you have the correct size and type. Refer to your furnace’s manual or the old filter itself for guidance. There are various types of filters available, including fiberglass, pleated, and electrostatic filters, each with different levels of filtration and longevity.

2. Turn Off the Furnace

Prior to removing the old filter, shut off the furnace to prevent any potential harm. This step is crucial for your safety and the longevity of your furnace.

3. Remove the Old Filter

Follow the instructions provided with your furnace to remove the old filter. Typically, you’ll need to slide it out of its compartment or slot. Be cautious not to damage any surrounding components or disturb the wiring.

4. Insert the New Filter

Take the new filter and insert it into the designated slot, following the directional arrows printed on the filter. Ensure it fits snugly and securely. Proper installation will guarantee optimal airflow and filtration.

5. Restart the Furnace

After securely inserting the new filter, turn the furnace back on. Monitor the system for any unusual sounds or issues to ensure everything is running smoothly.


Knowing the old furnace filter location is essential for maintaining your heating system’s efficiency and improving indoor air quality. By regularly replacing the filter, you can prolong the lifespan of your furnace and enjoy a cleaner and healthier home. Remember to consult your furnace’s manual or seek professional assistance if you encounter any difficulties along the way.