HVAC Ductwork, Air Handling & Mechanical Products worked example

Assembly Labor with duct sections or ahu assemblies of 40 units: a worked example in hvac ductwork, air handling & mechanical products

Suppose duct sections or ahu assemblies falls to 40 units. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate total assembly labor cost for ductwork fabrication or air handling unit assembly. Enter the number of duct sections or AHU assemblies, labor hours per unit, loaded labor rate, and a fixed setup or staging cost to get total and per-unit labor cost.

The inputs for this scenario

  • Duct sections or AHU assemblies: 40 units (the input this scenario stresses; the baseline uses 80)
  • Labor hours per unit: 0.6 hr / unit (held at the documented default)
  • Loaded labor rate: 65 $ / hr (held at the documented default)
  • Fixed setup and staging cost: 400 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Direct labor cost = units × hours per unit × loaded rate.
  • Weighted cost works out to 416 $ at these inputs, and this is the headline figure for the scenario.
  • Per piece value works out to 10.39 $ / piece at these inputs.
  • Captured value works out to 15.6 $ at these inputs.
  • Fixed adjustment works out to 400 $ at these inputs.

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 3.62% below the baseline at 416 $.
  • It computes total assembly labor as units times hours-per-unit times the loaded rate plus a fixed setup cost, then divides by units to give cost per unit. 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

  • Weighted cost: 416 $ (headline result)
  • Per piece value: 10.39 $ / piece
  • Captured value: 15.6 $
  • Fixed adjustment: 400 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Assembly Labor calculator, set duct sections or ahu assemblies to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.