Cleanroom & Contamination Control worked example

Pass-Through Utilization at 58% target pass-through utilization: a worked example

This worked example runs the pass-through utilization numbers for a tougher week than the baseline: 58% target pass-through utilization instead of the typical 80%. Calculate utilization of pass-through chambers, airlocks, or material transfer ports based on completed transfer cycles versus available cycles.

The inputs for this scenario

  • Completed pass-through transfer cycles: 380 cycles (held at the documented default)
  • Available pass-through transfer cycles: 520 cycles (held at the documented default)
  • Target pass-through utilization: 58 % (the input this scenario stresses; the baseline uses 80)

Working through the calculation

  • The calculation starts from the formula this tool documents: Pass-Through Utilization = completed pass-through transfer cycles ÷ available pass-through transfer cycles × 100.
  • Pass-Through Utilization result works out to 73.08 % at these inputs, and this is the headline figure for the scenario.
  • Pass-Through Utilization gap to target works out to -15.08 points at these inputs.
  • Completed pass-through transfer cycles works out to 380 count at these inputs.
  • Available pass-through transfer cycles works out to 520 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target pass-through utilization sits at 80% and the headline result is 73.08 %, this scenario lands almost exactly on the baseline at 73.08 %.
  • Use it during capacity reviews, when sizing or justifying a new pass-through, or when diagnosing material-flow bottlenecks into a cleanroom. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Pass-Through Utilization result: 73.08 % (headline result)
  • Pass-Through Utilization gap to target: -15.08 points
  • Completed pass-through transfer cycles: 380 count
  • Available pass-through transfer cycles: 520 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Pass-Through Utilization calculator, set target pass-through utilization to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.