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Library: Ø25–1,000 mm, single units up to about 52,000 m³/h — larger duties go straight to an engineer. Prefer to talk it through? Send your specs to an engineer Browse all Backward Curved Centrifugal Fans models with curves on the Fan Selector →

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  • Brand owner since 1990
  • Yuyao, Ningbo
  • 12-month standard warranty, extendable to 18–24 months by project agreement
  • Reply within 1 business day

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Each document covers only the models listed in it; ISO certificates cover management systems, not products. Declaration of Conformity for your model and destination on request.

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Test & release at LONGWELL

Specified and drawn by LONGWELL, built to our drawings by qualified partner factories, inspected and released to LONGWELL standards.

  • Wind tunnel · AMCA 210 method
  • Semi-anechoic room · sound power testing
  • Outgoing sampling to AQL 2.5
  • Test records retained for 5 years

How ordering works

  1. Spec check duty point & drawings
  2. Samples 1–3 days (stock models), fee credited to first order
  3. Validation on your bench
  4. Order T/T 30/70 (first order)
  5. Production & release 15–30 days, partner factory
  6. Shipping & after-sales FOB · CIF · DDP
Full terms, QC and FAQ
Current book for Backward Curved Centrifugal Fans
Backward Curved Centrifugal Fans PDF

Backward Curved Centrifugal Fans

Backward Curved Centrifugal Fans
Longwell Backward Curved Centrifugal Fans are engineered for high static pressure and low energy consumption. Their self-cleaning blade design prevents dust accumulation, ensuring consistent airflow performance.
These fans are widely used in HVAC systems, filtration units, and air-handling equipment. Longwell backward curved fans deliver quiet operation and superior reliability under continuous-duty conditions.