Air To Cloth Ratio Calculator

Understanding Air to Cloth Ratio

The air to cloth ratio is a critical parameter in the design and operation of baghouse dust collectors. It is defined as the amount of air passing through one square foot of filter media per minute. This ratio helps determine the efficiency and effectiveness of a dust collection system.

How to Use the Air to Cloth Ratio Calculator

Using the air to cloth ratio calculator is straightforward. You need to input the air flow rate (in cubic feet per minute) and the total cloth area (in square feet). The calculator will then provide you with the air to cloth ratio.


The formula for calculating the air to cloth ratio is:


  • Air Flow Rate (CFM): The volume of air passing through the system per minute.
  • Cloth Area (sq. ft): The total surface area of the filter media.

Example Solve

Let’s say you have an air flow rate of 5000 CFM and a cloth area of 1000 square feet. Plugging these values into the formula:

This means the air to cloth ratio is 5:1.

Frequently Asked Questions (FAQs)

What is a good air to cloth ratio?
A good air to cloth ratio typically ranges from 3:1 to 4:1 for general dust collection. However, the optimal ratio can vary depending on the type of dust and the specific application.

Why is the air to cloth ratio important?
The air to cloth ratio impacts the efficiency of the dust collection system. A high ratio can lead to faster clogging of the filters, while a low ratio may result in insufficient air flow and poor performance.

How do I increase the cloth area?
You can increase the cloth area by adding more filter bags or increasing the size of the existing ones. This helps to lower the air to cloth ratio and improve system performance.

Can the air to cloth ratio affect filter life?
Yes, a higher air to cloth ratio can lead to quicker wear and tear of the filter media, reducing its lifespan. Maintaining an optimal ratio helps prolong the filter’s life.


The air to cloth ratio is an essential factor in designing and maintaining efficient dust collection systems. By understanding and optimizing this ratio, you can ensure better performance and longer filter life. Use the air to cloth ratio calculator provided below to easily determine the ratio for your system.

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