What Are the Most Common Furnace Filter Sizes?

When it comes to furnace filters, the most common sizes are 1 inch, 2 inch, and 4 inch deep. These filters are standard in many homes, but some may be equipped with thicker filters that can handle more buildup and trap more particles than a standard filter. However, these filters can sometimes restrict airflow, which can lead to air and system quality problems. To find the right filter size for your furnace, you can use a furnace filter size chart or measure the length, width, and depth of the filter.

The most common furnace filter sizes are 16x20x1 air filter, 20x20x1 air filter, 16x25x1 air filter, and 20x25x1 air filter. It's important to confirm what your MERV rating converts to in order to ensure you're using a safe filter for your furnace. If your HVAC system uses a whole-house filter (which is usually close to your central furnace or air conditioning unit), the model number will most likely appear instead of the dimensions. Note that the sizes of the air conditioner and furnace filters must be smaller than the dimensions of the filter compartment.

To be safe, you should check if your furnace manufacturer has a maximum MERV rating that your furnace model can use. When searching by brand, such as Lennox or Carrier, to find a Carrier furnace filter size by model number, you can use a Carrier filter size search from the table above or with a Lennox size search facing up. Understanding more about the sizes of air conditioning and furnace filters can ensure you find the perfect size for your home. Using a furnace filter size chart makes it easy to find the correct filter size for your furnace. Now instantly improve air quality by choosing the right MERV rating because your family deserves the best.

Mary Swopshire
Mary Swopshire

Friendly beer aficionado. Tv nerd. Hipster-friendly writer. Friendly internet specialist. Professional beer maven. Extreme twitter guru.

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