HVAC Ductwork, Air Handling & Mechanical Products worked example

Assembly Labor with duct sections or ahu assemblies of 200 units: a worked example in hvac ductwork, air handling & mechanical products

This scenario runs the assembly labor calculation on the strong side: duct sections or ahu assemblies of 200 units, with every other input held at its documented default. Use this when quoting ductwork fabrication or AHU assembly labor. A ductwork shop estimator working on a large commercial project needs to know how many shop hours the duct sections will take, what those hours cost at the shop's loaded labor rate, and what the fixed setup costs add to the job. Adjust the efficiency factor to reflect the complexity of fittings, transitions, and offsets on the project.

The inputs for this scenario

  • Duct sections or AHU assemblies: 200 units (raised for this scenario; the documented default is 80)
  • Labor hours per unit: 0.6 hr / unit (unchanged)
  • Loaded labor rate: 65 $ / hr (unchanged)
  • Fixed setup and staging cost: 400 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Direct labor cost = units × hours per unit × loaded rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 478 $ for weighted cost, the number this scenario is built around.
  • At this operating point the engine returns 2.39 $ / piece for per piece value.
  • At this operating point the engine returns 78 $ for captured value.
  • At this operating point the engine returns 400 $ for fixed adjustment.

How this compares with the baseline

  • Against the tool's baseline example, where duct sections or ahu assemblies sits at 80 units and the headline result is 431 $, this scenario comes in 10.85% above the baseline at 478 $.
  • Use it when quoting a fabrication batch, setting standard labor for a duct or AHU product, or checking actual hours against the estimate after a run. 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

  • Weighted cost: 478 $ (headline result)
  • Per piece value: 2.39 $ / piece
  • Captured value: 78 $
  • Fixed adjustment: 400 $

Run it with your numbers

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

Last reviewed 2026-05-12.