Rosenberg GKHR 355 Alternative — LONGWELL LWBE3G-355-EC

Looking for an alternative for Rosenberg GKHR 355-CIK.121.4FF? The LONGWELL LWBE3G-355-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 10–16 weeks ex-works Rosenberg. Widely deployed across AHU/RTU OEM, plenum AHU, commercial HVAC.

Replaces: Rosenberg GKHR 355-CIK.121.4FF Diameter: Ø355 mm Family: GKHR series → LONGWELL LWBE3G / LWAE3G / LWHV / LWFC Sample: 1–3 days

Replacing

Rosenberg
GKHR 355

GKHR series · EC plug fan · Ø355 mm

→

With

LONGWELL
LWBE3G-355-EC

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

Specification Comparison

Specification	Rosenberg GKHR 355	LONGWELL LWBE3G-355-EC
Fan type	EC plug fan	EC plug fan
Impeller diameter	Ø355 mm	Ø355 mm Drop-in
Airflow range	800–4,500 m³/h	800–4,500 m³/h
Static pressure (max)	1,200 Pa	1,200 Pa
Motor power (max)	950 W	950 W
Wire-to-air η peak (AMCA 210)	89%	87%
Noise floor (Lw)	68 dB(A)	71 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)	10–16 weeks	15–30 days
Landed cost index (LONGWELL = 100)	175–200	100 (baseline)

Engineered match verified against Rosenberg GKHR 355-CIK.121.4FF in LONGWELL's cross-brand model library (record: LWBE3G-355-EC ← GKHR 355). EC plug fan, same mounting footprint, same control protocols.

Why Engineers Switch from GKHR 355 to LWBE3G-355-EC

4–8× Faster Delivery

15–30 days

vs 10–16 weeks ex-works for Rosenberg 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 LWBE3G-355-EC matches the Rosenberg GKHR 355 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 LWBE3G-355-EC accepts the same 0–10 V analog speed reference, PWM (1 kHz), and Modbus RTU (RS485) control signals as Rosenberg GKHR 355. Default Modbus register map is compatible with the Rosenberg ecosystem; LONGWELL provides a free Modbus map cross-reference for BMS integration. Rosenberg-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 LWBE3G-355-EC sits within 2–3% of the Rosenberg GKHR 355 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 87% vs 89% for Rosenberg (2 pp delta at peak). In typical part-load HVAC duty, the gap narrows to within 1 pp.

Typical Applications

The LWBE3G-355-EC is widely deployed across AHU/RTU OEM, plenum AHU, commercial HVAC. Common application categories include:

AHU/RTU OEM
Plenum AHU
Commercial HVAC

Particularly suited for EU AHU/RTU OEM specifications.

FAQ

Is LONGWELL LWBE3G-355-EC a true drop-in replacement for Rosenberg GKHR 355?

Yes. The LWBE3G-355-EC matches the GKHR 355 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 380–480 V 3Φ supply. Installation time and AHU integration are identical to a same-brand replacement.

How does LWBE3G-355-EC compare on efficiency to GKHR 355?

Rosenberg GKHR 355 delivers 89% peak wire-to-air efficiency at BEP. LONGWELL LWBE3G-355-EC measures 87% 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: Rosenberg GKHR 355 requires 10–16 weeks ex-works due to ongoing allocation. LONGWELL LWBE3G-355-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 Ø355 mm inventory.

What’s the cost delta?

At equivalent specification (same Ø, same airflow/Pa, same IP, same control), LONGWELL LWBE3G-355-EC typically lands at 40–55% below Rosenberg GKHR 355 ex-works pricing. Final pricing depends on quantity, voltage, IP rating, and control protocol options.

What applications is LWBE3G-355-EC typically used for?

LWBE3G-355-EC is widely deployed across AHU/RTU OEM, plenum AHU, commercial HVAC. Particularly suited for EU AHU/RTU OEM specifications.

Replace your GKHR 355 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

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Rosenberg® is a trademark of its owner. LONGWELL is an independent manufacturer and is not affiliated with, endorsed by, or sponsored by Rosenberg. This page is published as engineering reference based on public datasheets.