Industrial Fans, Blowers & Air Movement Equipment worked example

Paint Area at 90% spray transfer efficiency: a worked example

This scenario runs the paint area calculation on the strong side: 90% spray transfer efficiency, with every other input held at its documented default. Use it when planning paint, powder, primer, or coating needs for fan housings, bases, guards, and blower assemblies.

The inputs for this scenario

  • Fan housing surface area to coat: 850 sq ft (unchanged)
  • Coating consumption per square foot: 0.01 gal / sq ft (unchanged)
  • Spray transfer efficiency: 90 % (raised for this scenario; the documented default is 78)

Working through the calculation

  • Applying the documented formula (Required coating amount = fan surface area to coat × coating use per square foot ÷ actual transfer efficiency) to the inputs above produces each figure below.
  • At this operating point the engine returns 11.33 sq ft for required quantity, the number this scenario is built around.
  • At this operating point the engine returns 10.2 gal for theoretical coating amount.
  • At this operating point the engine returns 1.13 gal for coating loss allowance.
  • At this operating point the engine returns 90 % for efficiency.

How this compares with the baseline

  • Against the tool's baseline example, where spray transfer efficiency sits at 78% and the headline result is 13.08 sq ft, this scenario comes in 13.33% below the baseline at 11.33 sq ft.
  • Use it when quoting or batching a finishing run for fan housings, scrolls, or impellers and you need a purchase quantity that survives real-world overspray. 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

  • Required quantity: 11.33 sq ft (headline result)
  • Theoretical coating amount: 10.2 gal
  • Coating loss allowance: 1.13 gal
  • Efficiency: 90 %

Run it with your numbers

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

Last reviewed 2026-05-12.