H1: Industrial Dust Collection Fans: Sizing for Clean, Compliant AirMeta description: Dust collection fan sizing depends on hood capture velocity, duct velocity, and particulate type. Learn how to specify a fan that meets ATEX and OSHA limits.
IntroA dust collection system is only as good as the fan moving contaminated air through it. Undersize the fan and dust drops out in the duct; oversize it and you waste energy and wear out filters. The goal is a stable, slightly negative pressure that captures fumes at the source without pulling in excess room air.
Why it matters
Health: combustible dust (wood, metal, grain) is an explosion risk—fan and motor must be rated for the zone.
Compliance: capture velocity at the hood must meet exposure limits; weak capture means fines and unsafe air.
Efficiency: right duct velocity (typically 16–20 m/s for fine dust) prevents settling and re-entrainment.
Recommended fan types (Tefeng series)
Dust type | Fan type | Tefeng series |
General dust | Centrifugal collector fan |
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Explosive dust | ATEX centrifugal |
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High temp fume | High-temp centrifugal |
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Clean side / return | Backward-curved |
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Key design notes
Size from total airflow = sum of hood flows; then select static pressure = duct friction + filter resistance + hood loss.
For combustible dust, specify spark-resistant construction and ground the system; verify ATEX zone.
Place the fan on the clean side where possible to extend impeller life.
FAQQ: What duct velocity prevents dust from settling? A: For most fine dusts, 16–20 m/s in the main duct is typical; heavier or sticky particulates need more. Below ~14 m/s, dropout becomes likely.
Q: Do I need an explosion-proof fan? A: If the dust is combustible and the concentration can reach the explosive range, yes—specify ATEX-rated fan, motor, and bonded ductwork.
Q: Centrifugal or axial for dust collection? A: Centrifugal, almost always—higher static pressure to overcome filters and duct resistance, plus better impurity tolerance.
CTA: Send your process details and we will size the dust collection fan. [Request a quote].