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Ziehl-Abegg FN091 Alternative — LONGWELL LWAE3G900

Looking for an alternative for Ziehl-Abegg FN091-ZIQ.GG.A7? The LONGWELL LWAE3G900 is the same-size alternative — same control protocol, mounting dimensions on the LONGWELL drawing, performance characterized using AMCA 210/211 test methods (test report on request) — at 40–55% lower landed cost with 15–30 day delivery vs 16–22 weeks ex-works Ziehl-Abegg. Widely deployed across hyperscale data center free cooling, cooling tower, large dry cooler.

Replaces: Ziehl-Abegg FN091-ZIQ.GG.A7 Diameter: Ø910 mm Family: FN axial → LONGWELL LWBE3G / LWAE3G / LWHV / LWFC Sample: 1–3 days
Replacing
Ziehl-Abegg
FN091
FN axial · EC axial fan · Ø910 mm
→
With
LONGWELL
LWAE3G900
Same size class (Ø910 mm) — mounting per drawing · Same control · 15–30 day delivery

Specification Comparison

Specification Ziehl-Abegg FN091 LONGWELL LWAE3G900
Fan type EC axial fan EC axial fan
Impeller diameter Ø910 mm Ø910 mm 2 models
Airflow range 11,000–34,000 m³/h up to 32,313 m³/h
Static pressure (max) 380 Pa up to 365 Pa
Motor power (max) 8,500 W up to 2,785 W
Noise floor (Lw) 82 dB(A) from 76 dB(A) (nameplate, per model)
Voltage 380–480 V 3Φ 380–400 V 3Φ
Control input 0–10 V / PWM / Modbus / EC-Control 0–10 V / PWM / Modbus RTU (RS485)
IP rating IP54 / IP55 IP54 std · IP55 / IP67 option
Certifications CE · UL · VDE · EAC CE · RoHS · REACH · ETL on request
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)
Verify it on the LONGWELL selector: all 2 LWAE3G900 models — data, measured curves, drawings · LWAE3G900TS-5MGW-01 (largest airflow in the series) · check your own duty point · samples, MOQ and lead time

Why Engineers Switch from FN091 to LWAE3G900

4–8× Faster Delivery

15–30 days
vs 16–22 weeks ex-works for Ziehl-Abegg in 2026. Sample units 1–3 days from stock vs 4–10 weeks.

40–55% Lower Landed Cost

−€600 to −€2,400
per unit at equivalent spec, depending on size and quantity. On a 50-unit FanGrid retrofit, typical CapEx delta is €30k–€120k.

Drop-in Candidate · Same Size Class

Ø910 mm
Same impeller size and control protocol; confirm the mounting hole pattern and inlet ring against the LONGWELL drawing before ordering.

Drop-in compatibility: what matches and what to confirm

Mechanical match

The LONGWELL LWAE3G900 matches the Ziehl-Abegg FN091 mounting pattern (M-mount, ISO 9001 plenum-fan footprint) per the mounting dimensions on the LONGWELL drawing. Inlet ring diameter, motor shaft height, and electrical termination box position are identical. In most retrofits no plate modification is needed — confirm the mounting dimensions against the LONGWELL drawing before ordering.

Electrical & control match

The LWAE3G900 accepts the same 0–10 V analog speed reference, PWM (1 kHz), and Modbus RTU (RS485) control signals as Ziehl-Abegg FN091. LONGWELL supplies its Modbus RTU register map with the fan so the BMS points can be re-mapped; the register addresses are not identical to the Ziehl-Abegg map.For ebm-papst-specific bus protocols (EC-Control), ask LONGWELL engineering for the integration options.

Performance match

The measured P-Q curve of every LONGWELL model is on its model page; we check your duty point against it before quoting.

Typical Applications

The LWAE3G900 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 LWAE3G900 a true drop-in replacement for Ziehl-Abegg FN091?
Same size class and control interface. Confirm the mounting hole pattern, inlet ring diameter and shaft height against the dimensioned drawing on the LONGWELL LWAE3G900 model page before ordering; it accepts the same 0–10 V analog / PWM / Modbus RTU control signals and is offered in the voltages listed in the table above.
How does LWAE3G900 compare on efficiency to FN091?
LONGWELL does not publish a single peak-efficiency figure for the LWAE3G900. The model page on the selection site gives airflow, static pressure and input power along the curve (measured where marked, nameplate-estimated otherwise), so the efficiency at your duty point follows directly; a test report for a specific model is available from engineering on request.
What’s the 2026 lead time difference?
As of May 2026: Ziehl-Abegg FN091 requires 16–22 weeks ex-works due to ongoing allocation. LONGWELL LWAE3G900 ships in 15–30 days for orders up to 500 units and 6–10 weeks for 1,000+ unit OEM programs. Sample units ship in 1–3 days from stocked Ø910 mm inventory.
What’s the cost delta?
At equivalent specification (same Ø, same airflow/Pa, same IP, same control), LONGWELL LWAE3G900 typically lands at 40–55% below Ziehl-Abegg FN091 ex-works pricing. Final pricing depends on quantity, voltage, IP rating, and control protocol options.
What applications is LWAE3G900 typically used for?
LWAE3G900 is widely deployed across hyperscale data center free cooling, cooling tower, large dry cooler. Particularly suited for hyperscale data center free cooling at coil-array scale.

Replace your FN091 — samples in 1–3 days

Send a quick request — model + quantity + delivery address. Sample unit ships in 1–3 days for field validation. Series production at 15–30 day lead time after PO.

Request Sample View Full Cross-Reference Table
Official Product Page
Browse the full EC Axial Fans range on longwellfans.com — request a quote on LWAE3G900 directly.
View on longwellfans.com →
Ziehl-Abegg® is a registered trademark of its owner. This page is published by LONGWELL, an independent manufacturer and is not affiliated with, endorsed by, or sponsored by Ziehl-Abegg. All performance data sourced from publicly available datasheets. All performance figures reflect specific test conditions; final selection should be confirmed by duty point, voltage/control, mounting and project validation.