HVAC Ductwork, Air Handling & Mechanical Products calculator
Ductwork and AHU Rework Cost Calculator
Rework cost in ductwork fabrication and air handling unit production covers the labor, material, and overhead required to correct sections, panels, fittings, or coil assemblies that failed inspection or testing. Common rework events include re-sealing leaking seams, re-cutting sections that are out of dimensional tolerance, re-rolling Pittsburgh seam failures, re-brazing coil tube connections that failed pressure test, and re-painting or re-coating sections with surface defects. Multiplying the rework rate by the rework cost per event and the total units produced gives the variable rework cost. Adding fixed rework area overhead gives the total.
What this calculator does
- Estimate the total rework cost for ductwork fabrication or air handling unit production. Enter total units produced, rework cost per event, the rework rate, and fixed rework area overhead to calculate total rework exposure and rework cost per good unit.
- Use this when reviewing the quality cost of your ductwork fabrication or AHU assembly operation. Rework on ductwork may include re-sealing leaking joints, re-cutting off-size sections, re-rolling seams, re-forming flanges, or re-brazing leaking coil connections. Quantifying the rework cost per good unit helps justify investment in process improvements, better tooling, or operator training.
- Turns duct sections or ahu assemblies produced, average rework cost per event, rework rate into a weighted cost for rework cost in hvac ductwork, air handling and mechanical products.
Formula used
- Variable rework cost = units produced × rework rate × cost per event
- Total rework cost = variable rework cost + fixed overhead
- Rework cost per good unit = total rework cost ÷ (units × (1 - rework rate))
Inputs explained
- Duct sections or AHU assemblies produced: undefined
- Average rework cost per event: undefined
- Rework rate: undefined
- Fixed rework area overhead per period: undefined
How to use the result
- Use it when rework cost in hvac ductwork, air handling and mechanical products is being scored for capture or weighted cost.
- Risk-adjustments and discount rates are not in the formula; layer them on top for capital reviews.
Common questions
- How does this rework cost calculator help my hvac ductwork, air handling and mechanical products team? Estimate the total rework cost for ductwork fabrication or air handling unit production. Enter total units produced, rework cost per event, the rework rate, and fixed rework area overhead to calculate total rework exposure and rework cost per good unit. You get a weighted cost you can defend before quoting, scheduling, or sign-off.
- Where do I get the inputs for this hvac ductwork, air handling and mechanical products calculator? duct sections or ahu assemblies produced, average rework cost per event, rework rate usually move the weighted cost most. Pull from measured hvac ductwork, air handling and mechanical products runs, supplier data, and recent quotes rather than memory.
- How should I act on the output? Use the weighted cost in the hvac ductwork, air handling and mechanical products business case or quote build-up.
- What can throw the result off? Confirm the capture factor is honest; over-stated capture is the most common reason these models miss.
Last reviewed 2026-05-12.