Ziehl-Abegg FN040 Alternative — LONGWELL LWAE3G-400-EC

Looking for an alternative for Ziehl-Abegg FN040-4EQ.4I.A7? The LONGWELL LWAE3G-400-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 12–18 weeks ex-works Ziehl-Abegg. Widely deployed across heat pump split outdoor, commercial condenser, BESS C&I cabinet.

Replaces: Ziehl-Abegg FN040-4EQ.4I.A7 Diameter: Ø400 mm Family: FN axial → LONGWELL LWBE3G / LWAE3G / LWHV / LWFC Sample: 1–3 days

Replacing

Ziehl-Abegg
FN040

FN axial · EC axial fan · Ø400 mm

→

With

LONGWELL
LWAE3G-400-EC

Drop-in dimensional match · Same control · 15-day delivery

Specification Comparison

Specification	Ziehl-Abegg FN040	LONGWELL LWAE3G-400-EC
Fan type	EC axial fan	EC axial fan
Impeller diameter	Ø400 mm	Ø400 mm Drop-in
Airflow range	1,800–6,500 m³/h	1,800–6,500 m³/h
Static pressure (max)	320 Pa	320 Pa
Motor power (max)	850 W	850 W
Wire-to-air η peak (AMCA 210)	62%	60%
Noise floor (Lw)	68 dB(A)	70 dB(A)
Voltage	200–240 V 1Φ	200–240 V 1Φ
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)	12–18 weeks	15–30 days
Landed cost index (LONGWELL = 100)	175–200	100 (baseline)

Why Engineers Switch from FN040 to LWAE3G-400-EC

4–8× Faster Delivery

15–30 days

vs 12–18 weeks ex-works for Ziehl-Abegg in 2026 (active allocation). 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.

True Drop-In Compatibility

±0.5 mm

mounting hole tolerance + identical control protocol. Installation time same as same-brand replacement.

Drop-In Compatibility Details

Mechanical match

The LONGWELL LWAE3G-400-EC matches the Ziehl-Abegg FN040 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-400-EC accepts the same 0–10 V analog speed reference, PWM (1 kHz), and Modbus RTU (RS485) control signals as Ziehl-Abegg FN040. 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-400-EC sits within 2–3% of the Ziehl-Abegg FN040 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-400-EC is widely deployed across heat pump split outdoor, commercial condenser, BESS C&I cabinet. Common application categories include:

Heat pump split
Commercial condenser
BESS cabinet

Particularly suited for heat pump split outdoor and BESS C&I cabinet.

FAQ

Is LONGWELL LWAE3G-400-EC a true drop-in replacement for Ziehl-Abegg FN040?

Yes. The LWAE3G-400-EC matches the FN040 dimensionally (mounting hole pattern, inlet ring diameter, motor shaft height) within ±0.5 mm tolerance, accepts the same 0–10 V analog / PWM / Modbus RTU control signals, and operates from the same 200–240 V 1Φ supply. Installation time and AHU integration are identical to a same-brand replacement.

How does LWAE3G-400-EC compare on efficiency to FN040?

Ziehl-Abegg FN040 delivers 62% peak wire-to-air efficiency at BEP. LONGWELL LWAE3G-400-EC measures 60% in AMCA 210/211 third-party testing — a 2 pp difference at peak. In typical part-load HVAC duty (30–80% of design airflow), the gap narrows to within 1 pp because both platforms hold flat η curves across their operating range.

What’s the 2026 lead time difference?

As of May 2026: Ziehl-Abegg FN040 requires 12–18 weeks ex-works due to ongoing allocation. LONGWELL LWAE3G-400-EC 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 Ø400 mm inventory.

What’s the cost delta?

At equivalent specification (same Ø, same airflow/Pa, same IP, same control), LONGWELL LWAE3G-400-EC typically lands at 40–55% below Ziehl-Abegg FN040 ex-works pricing. Final pricing depends on quantity, voltage, IP rating, and control protocol options.

What applications is LWAE3G-400-EC typically used for?

LWAE3G-400-EC is widely deployed across heat pump split outdoor, commercial condenser, BESS C&I cabinet. Particularly suited for heat pump split outdoor and BESS C&I cabinet.

Replace your FN040 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.

Request Sample View Full Cross-Reference Table

Official Product Page

Browse the full EC Axial Fans range on longwellfans.com — request a quote on LWAE3G-400-EC directly.

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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.