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Quality Control

Fan quality control on the line: balance grade, airflow and sound spot checks, hipot and insulation testing, and what a QC report should show you.

Forward-curved blower housing from low-volume tooling, 150 units a year

By longwell / July 27, 2026 / Engineering Cases

A Custom Stamping Die for 150 Fans a Year

Tooling economics usually assume volume. This customer commissioned a ...

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Fan filter kit adapting a 120mm axial fan to a 150mm cabinet cutout

By longwell / July 25, 2026 / Engineering Cases

The Cutout Is the Requirement, Not the Fan

The customer asked for a 150mm fan that barely exists. What their cabi...

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Cross-flow fan under fan quality inspection against drawing criteria

By longwell / July 10, 2026 / Engineering Cases

No Rust, No Burrs, No Gaps: the Drawing Said So

Most drawings specify what the fan does. This one also specified what ...

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