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  • Yuyao, Ningbo
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Product certificates cover only the models listed on each document — ask which ones apply to your model. 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

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  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
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Current book for Plastic Centrifugal Fan

Plastic Centrifugal Fan

Longwell Plastic Centrifugal Fans combine compact design with reliable high-pressure airflow, ideal for ducted ventilation and exhaust systems. The backward-curved or forward-curved blades provide smooth air delivery and low vibration.
Constructed from advanced polymers, Longwell centrifugal fans resist chemical corrosion, moisture, and dust accumulation. They are suitable for HVAC units, cleanroom environments, and industrial processes where metal fans may degrade over time.