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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.

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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
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Current book for Plastic Cross Flow Impeller

Plastic Cross Flow Impeller

Longwell Plastic Cross Flow Impellers produce a broad, even airflow across wide openings, making them ideal for air curtains, evaporator coils, and compact ventilation systems. Their cylindrical geometry ensures uniform distribution without hotspots or turbulence.
Using high-durability plastics, Longwell cross-flow impellers withstand long-term operation in humid, dusty, or corrosive environments. The design minimizes vibration and noise while maximizing airflow efficiency, making them suitable for commercial, industrial, and residential applications.