Industrial Minerals & Powder Processing worked example

Dust Collection Airflow Load at 17% system derating factor: a worked example

This scenario runs the dust collection airflow load calculation on the strong side: 17% system derating factor, with every other input held at its documented default. Use it when an EHS manager or process engineer needs to verify whether the existing baghouse or cartridge collector has enough capacity for current or expanded dust pickup points.

The inputs for this scenario

  • Number of active pickup points: 12 points (unchanged)
  • Average CFM per pickup point: 800 CFM (unchanged)
  • System derating factor: 17 % (raised for this scenario; the documented default is 15)

Working through the calculation

  • Applying the documented formula (Gross required airflow = number of active pickup points x average CFM per pickup point) to the inputs above produces each figure below.
  • At this operating point the engine returns 9,600 CFM for total load, the number this scenario is built around.
  • At this operating point the engine returns 565 CFM / hr for hourly equivalent.
  • At this operating point the engine returns 12 CFM for input load.
  • At this operating point the engine returns 800 % for system derating factor.

How this compares with the baseline

  • Against the tool's baseline example, where system derating factor sits at 15% and the headline result is 9,600 CFM, this scenario lands almost exactly on the baseline at 9,600 CFM.
  • Use it when specifying a new collector, adding a transfer point to an existing system, or auditing whether your fan still meets capture velocity after filter loading. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Total load: 9,600 CFM (headline result)
  • Hourly equivalent: 565 CFM / hr
  • Input load: 12 CFM
  • System derating factor: 800 %

Run it with your numbers

  • Every input above is editable in the live Dust Collection Airflow Load calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.