Ziehl-Abegg RH28C Alternative — LONGWELL LWBE3G280
Looking for a drop-in alternative for Ziehl-Abegg RH28C-VDK? The LONGWELL LWBE3G280 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 12–18 weeks ex-works Ziehl-Abegg. Widely deployed across Small AHU, compact FFU, edge data center, residential heat pump.
LWBE3G280
Specification Comparison
| Specification | Ziehl-Abegg RH28C | LONGWELL LWBE3G280 |
|---|---|---|
| Fan type | EC backward-curved centrifugal plug fan | EC backward-curved centrifugal plug fan |
| Impeller diameter | Ø280 mm | Ø280 mm 23 models |
| Airflow range | 500–2,400 m³/h | up to 4,377 m³/h |
| Static pressure (max) | 720 Pa | up to 1,751 Pa |
| Motor power (max) | 340 W | up to 1,355 W |
| Noise floor (Lw) | 62 dB(A) | from 69 dB(A) (nameplate, per model) |
| Voltage | 200–240 V 1Φ | 220–230 / 115 V 1Φ · 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 single-phase 115/230 V versions (UL 507 / CSA C22.2 No.113) |
| 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 RH28C to LWBE3G280
4–8× Faster Delivery
40–55% Lower Landed Cost
Drop-in Candidate · Same Size Class
Drop-in compatibility: what matches and what to confirm
Mechanical match
The LONGWELL LWBE3G280 matches the Ziehl-Abegg RH28C 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 LWBE3G280 accepts the same 0–10 V analog speed reference, PWM (1 kHz), and Modbus RTU (RS485) control signals as Ziehl-Abegg RH28C. 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 LWBE3G280 is widely deployed across Small AHU, compact FFU, edge data center, residential heat pump. Common application categories include:
- Small AHU
- FFU compact
- Edge data center
- Residential heat pump
Particularly suited for small commercial AHU and edge data center / compact FFU.
FAQ
Is LONGWELL LWBE3G280 a true drop-in replacement for Ziehl-Abegg RH28C?
How does LWBE3G280 compare on efficiency to RH28C?
What’s the 2026 lead time difference?
What’s the cost delta?
What applications is LWBE3G280 typically used for?
Replace your RH28C — 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.
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