What is Dust Collector (bag filter) Air to Cloth Ratio?

What is Dust Collector (bag filter) Air to Cloth Ratio?

 

What is Dust Collector Air to Cloth Ratio? – The ratio of gas volume (ACFM) to total cloth area (sq. ft.) of the bag filter.

First calculate the total cloth area of your collector by calculating the total filter area of each filter (bag diameter x 3.14 x length ÷ 144 [for number of inches in a square foot] = filter cloth area) and then multiply that figure by the total number of bags in the bag type dust collector. Take the CFM of the system and divide it by the total filter cloth area to get your air to cloth ratio.

In different countries, the unit of air to cloth ratio is different, please remember Please remember to do unit conversion.

Air to Cloth Ratio=gas volume of dust collector/total filtration area of all filter bags

 

For the bag filter to capture the dust from the airstream the unit must have a sufficient number of filters. As you push more air through the same amount of filter material the collection efficiency goes down. Maintaining an adequate air to cloth ratio enables the bag filter to operate at peak efficiencies, collecting more than 99.9% all dust particles that pass through it. For most applications, anything less than near peak efficiency will result in excessive emissions, violating pollution regulations and creating hazardous environment for workers and neighbors.