Industrial Filtration, Separation & Dust Collection worked example

Air-To-Cloth Ratio with collector airflow of 9,000 CFM: a worked example

Suppose collector airflow falls to 9,000 CFM. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate air-to-cloth ratio from collector airflow, inverse media area basis, unit conversion, and media service multiplier.

The inputs for this scenario

  • Collector airflow: 9,000 CFM (the input this scenario stresses; the baseline uses 18,000)
  • Inverse installed media area: 0 1 / sq ft (held at the documented default)
  • Unit conversion multiplier: 1 x (held at the documented default)
  • Media service multiplier: 1.1 x (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Air-to-cloth ratio = collector airflow × inverse installed media area × unit conversion multiplier × media service multiplier.
  • Result works out to 24.75 CFM / sq ft at these inputs, and this is the headline figure for the scenario.
  • Base product works out to 22.5 value at these inputs.
  • Multiplier works out to 1.1 x at these inputs.
  • Factor A x B works out to 22.5 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where collector airflow sits at 18,000 CFM and the headline result is 49.5 CFM / sq ft, this scenario comes in 50% below the baseline at 24.75 CFM / sq ft.
  • It computes the air-to-cloth ratio in CFM per square foot, with a service multiplier to adjust for demanding dust conditions. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Result: 24.75 CFM / sq ft (headline result)
  • Base product: 22.5 value
  • Multiplier: 1.1 x
  • Factor A x B: 22.5 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Air-To-Cloth Ratio calculator, set collector airflow to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.