Fix capture before you upsize the fan

Industrial ventilation for manufacturing plants fails when the first proposal is a larger fan or higher CFM before source capture, hood geometry, and duct constraints are understood. That path can be correct, but only after capture is diagnosed.

On plastics and textiles lines we routinely find mass loading and exposure problems that begin at the source, not at the fan curve. Adding air moves the symptom and locks in energy cost—without extended shutdowns as the fix, either.

A measurement basis (capture velocity, mass or concentration metrics, and room balance under defined modes) lets plant teams compare options before capital. CFD helps when layout alternatives change the spend. It is not a substitute for field diagnosis.

If your vendor package leads with CFM and omits capture geometry, treat that as a red flag, not a recommendation.