Ziehl-Abegg FN091 Alternative — LONGWELL LWAE3G-900-EC
Looking for an alternative for Ziehl-Abegg FN091-ZIQ.GG.A7? The LONGWELL LWAE3G-900-EC is the dimensionally interchangeable equivalent — same mounting, same control protocol, AMCA 210/211 third-party-tested performance — at 40–55% lower landed cost with 15-day delivery vs 16–22 weeks ex-works Ziehl-Abegg. Widely deployed across hyperscale data center free cooling, cooling tower, large dry cooler.
FN091
LWAE3G-900-EC
Specification Comparison
| Specification | Ziehl-Abegg FN091 | LONGWELL LWAE3G-900-EC |
|---|---|---|
| Fan type | EC axial fan | EC axial fan |
| Impeller diameter | Ø910 mm | Ø910 mm Drop-in |
| Airflow range | 11,000–34,000 m³/h | 11,000–34,000 m³/h |
| Static pressure (max) | 380 Pa | 380 Pa |
| Motor power (max) | 8,500 W | 8,500 W |
| Wire-to-air η peak (AMCA 210) | 62% | 60% |
| Noise floor (Lw) | 82 dB(A) | 84 dB(A) |
| Voltage | 380–480 V 3Φ | 380–480 V 3Φ |
| Control input | 0–10 V / PWM / Modbus / EC-Control | 0–10 V / PWM / Modbus RTU / Modbus TCP Compatible |
| IP rating | IP54 / IP55 | IP54 std · IP55 / IP67 option |
| Certifications | CE · UL · VDE · EAC | CE · UL · cUL · TÜV · ATEX · VDE · EAC · RoHS · REACH |
| Sample lead time | 4–10 weeks | 1–3 days |
| Series lead time (≤500 units) | 16–22 weeks | 15–30 days |
| Landed cost index (LONGWELL = 100) | 175–200 | 100 (baseline) |
Why Engineers Switch from FN091 to LWAE3G-900-EC
4–8× Faster Delivery
40–55% Lower Landed Cost
True Drop-In Compatibility
Drop-In Compatibility Details
Mechanical match
The LONGWELL LWAE3G-900-EC matches the Ziehl-Abegg FN091 mounting pattern (M-mount, ISO 9001 plenum-fan footprint) within ±0.5 mm tolerance. Inlet ring diameter, motor shaft height, and electrical termination box position are identical. Drop-in retrofit requires no AHU rework, no plate modification, and no plenum hole resizing.
Electrical & control match
The LWAE3G-900-EC accepts the same 0–10 V analog speed reference, PWM (1 kHz), and Modbus RTU (RS485) control signals as Ziehl-Abegg FN091. Default Modbus register map is compatible with the Ziehl-Abegg ecosystem; LONGWELL provides a free Modbus map cross-reference for BMS integration. Ziehl-Abegg-specific proprietary protocols (EC-Control bus / ZA-control) are bridged via a free MODBUS gateway available from LONGWELL Engineering — no BMS reprogramming required.
Performance match
The PQ curve of LONGWELL LWAE3G-900-EC sits within 2–3% of the Ziehl-Abegg FN091 curve across the full operating envelope (verified by third-party AMCA 210/211 testing at TÜV and Intertek labs). Wire-to-air efficiency at BEP is 60% vs 62% for Ziehl-Abegg (2 pp delta at peak). In typical part-load HVAC duty, the gap narrows to within 1 pp.
Typical Applications
The LWAE3G-900-EC is widely deployed across hyperscale data center free cooling, cooling tower, large dry cooler. Common application categories include:
- Hyperscale free cooling
- Cooling tower
- Large dry cooler
Particularly suited for hyperscale data center free cooling at coil-array scale.
FAQ
Is LONGWELL LWAE3G-900-EC a true drop-in replacement for Ziehl-Abegg FN091?
How does LWAE3G-900-EC compare on efficiency to FN091?
What’s the 2026 lead time difference?
What’s the cost delta?
What applications is LWAE3G-900-EC typically used for?
Replace your FN091 in 5 days
Send a quick request — model + quantity + delivery address. Sample unit ships in 1–3 days for field validation. Series production at 15-day lead time after PO.
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