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OEM / ODM · YUYAO, CHINA · FACTORY SUPPLY

EC Backward Curved Centrifugal Fan Manufacturer

LONGWELL manufactures EC backward-curved centrifugal fans and motorized impellers in Yuyao, China for AHUs, CRAH units, refrigeration, data-center cooling equipment and industrial OEM systems. Send airflow, static pressure, voltage, control interface and mounting constraints for a matched model, drawing, quotation and applicable model-specific documents.

Select EC models by duty point Send an RFQ

Certification, control, ingress-protection and electrical options vary by model and destination. Confirm the exact part number against the current document set.

Filter LONGWELL EC Fans models by airflow, static pressure, voltage or size. Every model on the Fan Selector lists its measured or digitised curve, dimensional drawing and datasheet.
Open in the Fan Selector →
Have your duty point?

See every LONGWELL model whose P-Q curve covers it — margins, noise and power included. No login.

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

Buying from LONGWELL

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

Certificates you can check

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.

All document scans and what each covers

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 Available EC backward-curved fan models

Available EC backward-curved fan models

EC fans pair a brushless DC motor with integrated drive electronics, so they vary speed on a 0-10 V, PWM or MODBUS signal while saving about 30 percent energy over AC equivalents. The motor and wheel sit in one sealed package across axial, centrifugal and backward-curved forms. They are the pick when efficiency targets actually get enforced.