HVAC Ductwork, Air Handling & Mechanical Products worked example

Coil Drain Rate at 70% acceptance pass rate target: a worked example

Suppose acceptance pass rate target falls to 70%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Calculate the coil leak test and drain pan test pass rate for chilled water, hot water, or DX coils in air handling unit production. Compare tested coils that pass to total coils tested and check the gap against your quality acceptance target.

The inputs for this scenario

  • Coils that passed leak and drain test: 243 coils (held at the documented default)
  • Total coils tested: 250 coils (held at the documented default)
  • Acceptance pass rate target: 70 % (the input this scenario stresses; the baseline uses 97)

Working through the calculation

  • The calculation starts from the formula this tool documents: Coil test pass rate = coils passed รท total coils tested.
  • Rate works out to 97.2 % at these inputs, and this is the headline figure for the scenario.
  • Gap to target works out to -27.2 points at these inputs.
  • Affected count works out to 243 count at these inputs.
  • Total count works out to 250 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where acceptance pass rate target sits at 97% and the headline result is 97.2 %, this scenario lands almost exactly on the baseline at 97.2 %.
  • It computes the percentage of tested coils that passed leak and drain testing and the point gap to your acceptance target. 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

  • Rate: 97.2 % (headline result)
  • Gap to target: -27.2 points
  • Affected count: 243 count
  • Total count: 250 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Coil Drain Rate calculator, set acceptance pass rate target to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.