Let’s first start in explaining what air-to-cloth ratio means. Air-to-Cloth ratio, which can also be known as Air-to-Media, is defined as a measurement of the amount of air passing through one square foot of filter media.
Generally the lower your air-to-cloth ratio, the more effectively your system is at removing dust -from the work environment. If operate on a higher air-to-cloth ratio, one of the common issues you will encounter is a decrease in suction. This is because there is too much dust being captured by an insufficient amount of filter media. The filter cake on your bag eventually builds up too quickly; resulting in a decrease in air velocity and suction. From there it becomes a domino effect; plant air quality decreases, filters clog quicker, valve life expectancy is impacted and you’ll be performing change-outs more frequently.
To calculate air-to-cloth ratio in your existing system, the simple formula is to take the amount of airflow (CFM) and divide that by the amount of filter area within your dust collector. For example a cartridge collector would have a normal range of 4:1 air to cloth ratio. Environments with a large ventilation area or more pick up points require a system with a higher CFM to provide adequate suction. To see which air to cloth ratio may be right for your project, download our air to cloth guide which provides the recommended ratio for a wide variety of applications.