Industrial Filtration, Separation & Dust Collection worked example

Air-To-Cloth Ratio with collector airflow of 45,000 CFM: a worked example

What does the result look like when collector airflow reaches 45,000 CFM? The full calculation is worked below with real intermediate numbers. Use it when checking baghouse or cartridge collector airflow against available filter media area.

The inputs for this scenario

  • Collector airflow: 45,000 CFM (raised for this scenario; the documented default is 18,000)
  • Inverse installed media area: 0 1 / sq ft (unchanged)
  • Unit conversion multiplier: 1 x (unchanged)
  • Media service multiplier: 1.1 x (unchanged)

Working through the calculation

  • Applying the documented formula (Air-to-cloth ratio = collector airflow × inverse installed media area × unit conversion multiplier × media service multiplier) to the inputs above produces each figure below.
  • At this operating point the engine returns 124 CFM / sq ft for result, the number this scenario is built around.
  • At this operating point the engine returns 113 value for base product.
  • At this operating point the engine returns 1.1 x for multiplier.
  • At this operating point the engine returns 113 value for factor a x b.

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 150% above the baseline at 124 CFM / sq ft.
  • A figure at this level is achievable when collector airflow is genuinely sustained, not just peaked for a shift. The ratio alone doesn't guarantee performance; the right value depends on dust type, particle size, cleaning method, and inlet loading, which it can't infer.

Results at a glance

  • Result: 124 CFM / sq ft (headline result)
  • Base product: 113 value
  • Multiplier: 1.1 x
  • Factor A x B: 113 value

Run it with your numbers

  • Every input above is editable in the live Air-To-Cloth Ratio calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.