Air Filter Size Chart

The Air Filter Size Chart provides the nominal and actual dimensions of various filter sizes and the commonly fitting examples for different types of furnaces and HVAC systems.
Filter Size (Inches) – Nominal Actual Size (Inches) – L x W x D Commonly Fits (Examples)
14 x 20 13.5 x 19.5 x 0.75 Standard residential furnaces
16 x 20 15.5 x 19.5 x 0.75 Standard residential furnaces
16 x 25 15.5 x 24.5 x 0.75 Larger residential furnaces
20 x 20 19.5 x 19.5 x 0.75 Common residential furnaces, air conditioners
20 x 25 19.5 x 24.5 x 0.75 High-capacity residential furnaces
20 x 30 19.5 x 29.5 x 0.75 High-capacity furnaces, commercial HVAC
24 x 24 23.5 x 23.5 x 0.75 Commercial HVAC systems
25 x 25 24.5 x 24.5 x 0.75 Industrial HVAC systems

The Air Filter Size Chart provides information about the nominal and actual sizes of air filters, as well as the commonly fitted examples. This chart is particularly useful for those who are looking to replace or purchase air filters for residential, commercial, or industrial HVAC systems. By knowing the filter size and the corresponding dimensions, users can ensure that they select the correct air filter that will fit their specific furnace or air conditioning unit. Additionally, the chart provides examples of the types of HVAC systems that commonly use each filter size, making it easier for users to determine the appropriate filter for their specific needs.


What is an air filter size chart?

An air filter size chart is a resource that lists various standard sizes of air filters available in the market.

How do I determine the size of my air filter?

To determine the size of your air filter, you can either refer to the existing filter's measurements or measure the dimensions of the filter slot using a tape measure.

Why is it important to choose the right size air filter?

Choosing the right size air filter is important because using a filter that doesn't fit properly can lead to poor air quality in your home, reduced HVAC system efficiency, and potential damage to the equipment.

What are the standard air filter sizes?

Standard air filter sizes include 1 inch, 2 inch, 4 inch, and 5 inch thickness with various dimensions in width and height, such as 16x20 inches, 20x25 inches, or 24x24 inches.

Where can I find an air filter size chart?

Air filter size charts can be found on manufacturer websites, HVAC supply stores, or in product catalogs. Online retailers also provide filter options with corresponding size charts for easy reference.

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We have not conducted any studies ourselves. Our article provides a summary of all the statistics and studies available at the time of writing. We are solely presenting a summary, not expressing our own opinion. We have collected all statistics within our internal database. In some cases, we use Artificial Intelligence for formulating the statistics. The articles are updated regularly.

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