Industrial Fans, Blowers & Air Movement Equipment worked example

Sheet Metal Housing Yield at 69% target housing first-pass yield: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop target housing first-pass yield to 69%, then walk the calculation through step by step. Calculate first-pass sheet metal housing yield from accepted housings, fabricated housings, and target yield.

The inputs for this scenario

  • Accepted fan housings first pass: 92 housings (held at the documented default)
  • Total housings fabricated: 100 housings (held at the documented default)
  • Target housing first-pass yield: 69 % (the input this scenario stresses; the baseline uses 96)

Working through the calculation

  • The calculation starts from the formula this tool documents: Sheet metal housing yield = accepted fan housings first pass ÷ total housings fabricated × 100.
  • Sheet metal housing yield works out to 92 % at these inputs, and this is the headline figure for the scenario.
  • Housing yield gap to target works out to -23 points at these inputs.
  • Accepted fan housings first pass works out to 92 count at these inputs.
  • Total housings fabricated works out to 100 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target housing first-pass yield sits at 96% and the headline result is 92 %, this scenario lands almost exactly on the baseline at 92 %.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to target housing first-pass yield, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. First-pass yield counts units, not cost, so one scrapped large welded scroll weighs the same as one minor rejected bracket even though their dollar impact differs hugely.

Results at a glance

  • Sheet metal housing yield: 92 % (headline result)
  • Housing yield gap to target: -23 points
  • Accepted fan housings first pass: 92 count
  • Total housings fabricated: 100 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Sheet Metal Housing Yield calculator, set target housing first-pass yield to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.