HVAC Ductwork, Air Handling & Mechanical Products worked example

Duct Sheet Yield at 99% shop yield target: a worked example

This scenario runs the duct sheet yield calculation on the strong side: 99% shop yield target, with every other input held at its documented default. Use this when your sheet metal shop needs to track how efficiently galvanized or stainless coil stock is converting into finished duct sections. A low yield may point to poor nesting, worn shear blades, oversized blanks, or excessive scrap at fittings.

The inputs for this scenario

  • Accepted duct sections or blanks: 233 pieces (unchanged)
  • Total sheet metal blanks processed: 250 pieces (unchanged)
  • Shop yield target: 99 % (raised for this scenario; the documented default is 95)

Working through the calculation

  • Applying the documented formula (Duct sheet yield = accepted pieces รท total pieces processed) to the inputs above produces each figure below.
  • At this operating point the engine returns 93.2 % for rate, the number this scenario is built around.
  • At this operating point the engine returns 5.8 points for gap to target.
  • At this operating point the engine returns 233 count for affected count.
  • At this operating point the engine returns 250 count for total count.

How this compares with the baseline

  • Against the tool's baseline example, where shop yield target sits at 95% and the headline result is 93.2 %, this scenario lands almost exactly on the baseline at 93.2 %.
  • Use it during a production run or shift review to gauge how efficiently sheet stock is converting to accepted duct sections. 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

  • Rate: 93.2 % (headline result)
  • Gap to target: 5.8 points
  • Affected count: 233 count
  • Total count: 250 count

Run it with your numbers

  • Every input above is editable in the live Duct Sheet Yield calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.