What is an Air-to-Cloth Ratio and How Do I Calculate It?

Dust Collector Filter from A.C.T. Dust CollectorsAlso referred to as an air-to-media ratio, an air-to-cloth ratio quantifies the amount of air going through one square foot of filter media. It is often used as a simple way to state the ratio between CFM and square feet of filter area. For example, if a dust collector was moving 4,000 CFM and had 2,000 ft² of filter area, we could say that it had a 4,000-to-2,000 ratio. This can be simplified to a 2:1 air-to-cloth ratio. So, to calculate an air-to-cloth ratio for a dust collector, we take the amount of airflow (CFM) and divide it by the amount of filter area within a dust collector.

Why is it important?

It is one of the more important factors in determining how long a filter will last in a given application. Although there are many factors that come into play when determining filter life, air-to-cloth ratios can give good guidance when determining the size of dust collector required for a given amount of air. A lower air-to-cloth ratio will result in longer filter life and is often used in nuisance applications, while a higher air-to-cloth ratio will result in shorter filter life and is often used when dust loading is very light.

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A.C.T. Dust Collectors offer the ultimate in air filtration. Whether your application includes welding smoke, grinding dust, cutting table fume, shot blasting, sanding, thermal spray, coating, bulk powder handling or any process that generates dust, we have the solution.

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