Replacing
Ziehl-Abegg
RH31C
RH series · EC backward-curved centrifugal
plug fan · Ø315 mm
→
With
Same size class (Ø310 mm) — mounting per drawing · Same control · 15–30 day delivery
Specification Comparison
| Specification |
Ziehl-Abegg RH31C |
LONGWELL LWBE3G310 |
| Fan type |
EC backward-curved centrifugal plug fan |
EC backward-curved centrifugal plug fan |
| Impeller diameter |
Ø315 mm |
Ø310 mm 24 models |
| Airflow range |
650–3,200 m³/h |
up to 5,593 m³/h |
| Static pressure (max) |
1000 Pa |
up to 1,730 Pa |
| Motor power (max) |
650 W |
up to 1,588 W |
| Noise floor (Lw) |
65 dB(A) |
from 63 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 RH31C to LWBE3G310
4–8× Faster Delivery
15–30 days
vs 12–18 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
Ø310 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 LWBE3G310 matches the Ziehl-Abegg RH31C 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 LWBE3G310 accepts the same 0–10 V analog speed reference, PWM (1 kHz), and Modbus RTU (RS485) control signals as Ziehl-Abegg RH31C. 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 LWBE3G310 is widely deployed across Commercial AHU, cold chain condensing unit, hybrid heat pump. Common application categories include:
- AHU
- Cold chain condensing unit
- Hybrid heat pump
Particularly suited for cold chain condensing units and hybrid heat pump split sections.
FAQ
Is LONGWELL LWBE3G310 a true drop-in replacement for Ziehl-Abegg RH31C?
Same size class and control interface. Confirm the mounting hole pattern, inlet ring diameter and shaft height against the dimensioned drawing on the LONGWELL LWBE3G310 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 LWBE3G310 compare on efficiency to RH31C?
LONGWELL does not publish a single peak-efficiency figure for the LWBE3G310. 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 RH31C requires 12–18 weeks ex-works due to ongoing allocation. LONGWELL LWBE3G310 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 Ø315 mm inventory.
What’s the cost delta?
At equivalent specification (same Ø, same airflow/Pa, same IP, same control), LONGWELL LWBE3G310 typically lands at 40–55% below Ziehl-Abegg RH31C ex-works pricing. Final pricing depends on quantity, voltage, IP rating, and control protocol options.
What applications is LWBE3G310 typically used for?
LWBE3G310 is widely deployed across Commercial AHU, cold chain condensing unit, hybrid heat pump. Particularly suited for cold chain condensing units and hybrid heat pump split sections.
Replace your RH31C — 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 Backward-Curved Centrifugal EC Fans range on longwellfans.com — request a quote on LWBE3G310 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.