Industrial Fans, Blowers & Air Movement Equipment worked example

Paint Area at 56% spray transfer efficiency: a worked example

This worked example runs the paint area numbers for a tougher week than the baseline: 56% spray transfer efficiency instead of the typical 78%. Estimate coating requirement from fan surface area, paint use per square foot, and transfer efficiency.

The inputs for this scenario

  • Fan housing surface area to coat: 850 sq ft (held at the documented default)
  • Coating consumption per square foot: 0.01 gal / sq ft (held at the documented default)
  • Spray transfer efficiency: 56 % (the input this scenario stresses; the baseline uses 78)

Working through the calculation

  • The calculation starts from the formula this tool documents: Required coating amount = fan surface area to coat × coating use per square foot ÷ actual transfer efficiency.
  • Required quantity works out to 18.21 sq ft at these inputs, and this is the headline figure for the scenario.
  • Theoretical coating amount works out to 10.2 gal at these inputs.
  • Coating loss allowance works out to 8.01 gal at these inputs.
  • Efficiency works out to 56 % at these inputs.

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 39.29% above the baseline at 18.21 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. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Required quantity: 18.21 sq ft (headline result)
  • Theoretical coating amount: 10.2 gal
  • Coating loss allowance: 8.01 gal
  • Efficiency: 56 %

Run it with your numbers

  • To rerun this with your own numbers, open the live Paint Area calculator, set spray transfer efficiency to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.