Independent Comparison · Updated 2026
LONGWELL vs ebm-papst vs Ziehl-Abegg
LONGWELL vs ebm-papst vs Ziehl-Abegg
EC Backward-Curved Centrifugal Fans
A spec-by-spec engineering comparison of the three leading EC fan platforms across efficiency, noise, IP rating, certifications, lead time, dimensional compatibility, and total landed cost. Data sourced from public datasheets (May 2026), AMCA 210/211 third-party tests, and LONGWELL in-house CFD/B&K acoustic lab measurements.
TL;DR — Decision Summary
- Need absolute best η + 24/7 hyperscale data center duty? ebm-papst GreenTech still leads at 90–92% peak η.
- Need quietest fan in residential / medical context? Ziehl-Abegg ZAbluefin wins on dB(A) (winglet impeller).
- Need 90% of European performance at 50–65% of cost, with 15-day lead time? LONGWELL LWBE3G is the engineering choice for heat pumps, BESS, cold chain, residential ventilation, retrofit projects, and OEM programs.
- Dimensionally identical? Yes — LONGWELL LWBE3G matches K3G / RH mounting patterns Ø133–Ø900. Drop-in replacement.
1 · The Three Platforms at a Glance
LONGWELL LWBE3G
EC backward curved · 35 yrs · China
- Range Ø133–Ø900 mm
- Peak η 88–90%
- Noise floor 38 dB(A) @ 1 m
- IP54 / IP55 standard, IP67 option
- 0–10 V / PWM / Modbus RTU / Modbus TCP
- CE, UL, TÜV, ATEX, RoHS, REACH
- Lead time 15–30 days (≤500 units)
- Drop-in dimensional match to K3G / RH
ebm-papst RadiCal / GreenTech
EC backward curved · DE · since 1963
- Range Ø133–Ø1250 mm
- Peak η 90–92%
- Noise floor 37 dB(A) @ 1 m
- IP54 / IP55 standard
- 0–10 V / PWM / MODBUS / EC-Control
- CE, UL, VDE, EAC
- Lead time 14–22 weeks (2026 allocation)
- Reference: K3G250 – K3G1250
Ziehl-Abegg ZAbluefin / ZAvblue
EC backward curved · DE · since 1910
- Range Ø250–Ø1120 mm
- Peak η 90–93% (ZAbluefin winglet)
- Noise floor 36 dB(A) @ 1 m
- IP54 / IP55 standard
- 0–10 V / PWM / Modbus / ZA-control
- CE, UL, VDE, EAC
- Lead time 12–18 weeks
- Reference: RH28C – RH112C
2 · Spec Comparison Matrix
| Specification | LONGWELL LWBE3G | ebm-papst GreenTech | Ziehl-Abegg ZAbluefin |
|---|---|---|---|
| Impeller diameter range | Ø133 – Ø900 mm | Ø133 – Ø1250 mm | Ø250 – Ø1120 mm |
| Airflow range | 350 – 26,000 m³/h | 500 – 40,000 m³/h | 800 – 35,000 m³/h |
| Static pressure (max) | 1,800 Pa | 2,200 Pa | 2,000 Pa |
| Peak wire-to-air η (AMCA 210) | 88–90% | 90–92% | 90–93% |
| SFP at BEP (W/L/s) | 0.50 – 0.65 | 0.42 – 0.55 | 0.40 – 0.52 |
| Noise floor (Lw @ 30% load) | 38 dB(A) @ 1 m | 37 dB(A) @ 1 m | 36 dB(A) @ 1 m |
| Motor protection | IP54 / IP55 std · IP67 opt | IP54 / IP55 | IP54 / IP55 |
| Insulation class | F (155°C) | F (155°C) | F (155°C) |
| Ambient T range | −40°C to +60°C | −25°C to +60°C | −30°C to +60°C |
| Control inputs | 0–10 V · PWM · MODBUS RTU · MODBUS TCP | 0–10 V · PWM · MODBUS · EC-Control | 0–10 V · PWM · MODBUS · ZA-control |
| IoT / cloud integration | LONGWELLBUS (free) | FanWizard / FanScout (paid) | ZA-graph / FanFinder |
| Certifications | CE · UL · cUL · TÜV · ATEX · RoHS · REACH · VDE · EAC | CE · UL · VDE · EAC | CE · UL · VDE · EAC |
| ATEX availability | Yes (II 3D Ex tc T125°C) | Limited SKU | Limited SKU |
| Warranty | 24 months (extended 36/60 OEM) | 24 months | 24 months |
| Sample lead time | 1–3 days | 6–10 weeks | 4–8 weeks |
| Series production lead time | 15–30 days (≤500u) · 6–10 wk (OEM) | 14–22 weeks (2026 allocation) | 12–18 weeks |
| Landed cost index (LWBE3G = 100) | 100 | 175 – 220 | 170 – 210 |
Cost index based on equivalent-spec Ø400 backward EC plenum fan, FOB Shenzhen vs ex-works Mulfingen / Künzelsau, May 2026. Excludes tariffs and freight.
3 · Dimensional Cross-Reference (Drop-in Replacement)
LONGWELL LWBE3G is engineered for dimensional interchangeability with ebm-papst K3G and Ziehl-Abegg RH series. Mounting hole patterns, inlet ring diameter, motor shaft height, and electrical termination match within ±0.5 mm tolerance.
| Diameter | LONGWELL | ebm-papst | Ziehl-Abegg | Typical Application |
|---|---|---|---|---|
| Ø250 | LWBE3G-250-EC | K3G250-AT39-71 | RH28C-VDK | Small AHU, residential ERV |
| Ø310 | LWBE3G-310-EC | K3G310-AY40-90 | RH35C-6DK | Cold chain, condensing unit |
| Ø355 | LWBE3G-355-EC | K3G355-PB47-04 | RH40C-4DK | Heat pump, FCU plenum |
| Ø400 | LWBE3G-400-EC | K3G400-AP31-03 | RH45C-4DK | Medium AHU, FFU, BESS |
| Ø450 | LWBE3G-450-EC | K3G450-PA31-03 | RH50C-6DK | Large AHU, data center CRAH |
| Ø500 | LWBE3G-500-EC | K3G500-PB31-A8 | RH56C-6DK | RDHx, in-row cooler |
| Ø560 | LWBE3G-560-EC | K3G560-AQ31-01 | RH63C-6DK | Industrial AHU, FanGrid |
| Ø630 | LWBE3G-630-EC | K3G630-AS50-01 | RH71C-6DK | Cooling tower, dust collector |
| Ø710 | LWBE3G-710-EC | K3G710-AY02-N1 | RH80C-6DK | Large CRAH, process exhaust |
| Ø800 | LWBE3G-800-EC | K3G800-AY13-A8 | RH90C-6DK | Stadium / atrium, large RTU |
| Ø900 | LWBE3G-900-EC | K3G900-AY16-K1 | RH100C-6DK | Large industrial / mining |
Full cross-reference (Ø133 onward, plus LWAE3G axial and LWFC forward-curved cross-refs): Cross Reference Table
4 · When to Choose Which
| Use Case | Best Choice | Why |
|---|---|---|
| Hyperscale data center, 24/7, >50 MW IT load | ebm-papst | 2 pp peak η × 24/7 × 10 yr life justifies premium; FanScout integration with major DCIM platforms |
| European OEM program, premium consumer brand | ebm-papst / Ziehl-Abegg | Brand marketing value + EU regulatory familiarity |
| Operating room / acoustic-critical residential | Ziehl-Abegg ZAbluefin | Winglet impeller: −1 to −2 dB(A) at low load vs alternatives |
| Heat pump OEM (R290, R32, R454B) volume program | LONGWELL LWBE3G / LWAE3G | Cost critical at >10,000-unit/yr volumes; R290 compatibility tested; 75°C ambient validated |
| BESS / EV charger thermal management | LONGWELL LWFC / LWAE3G | IP67 option, ATEX optional, 15-day samples for fast iteration |
| Cold chain evaporator, −40°C duty | LONGWELL LWAE3G / LWBE3G | Validated at −40°C ambient with anti-freeze coil heaters; 35% lower TCO |
| Residential ventilation (HRV / ERV) retail brand | LONGWELL LWBE3G-small + LWM | Passivhaus PHI components available, lowest landed cost in market |
| Retrofit project (replace failed ebm-papst K3G in field) | LONGWELL LWBE3G (drop-in) | 15-day delivery vs 14-22 week ebm-papst lead times; same mounting |
| ATEX dust collector (zone 22) | LONGWELL LWHV / LWBE3G-ATEX | Broader ATEX SKU coverage at lower cost than European premium brands |
| Industrial OEM with EU + China dual manufacturing | LONGWELL | China + Vietnam factories reduce tariff exposure; EU bonded warehouse |
5 · Total Cost of Ownership (10-Year Model)
Modeled on a 50-fan FanGrid in a 2 MW data center CRAH, 80% load factor, EU electricity at €0.18/kWh, 10-year operating horizon.
| Cost component | LONGWELL LWBE3G-500 | ebm-papst K3G500 | Ziehl-Abegg RH56C |
|---|---|---|---|
| CapEx (50 units) | €42,500 | €85,000 | €82,000 |
| Installation (drop-in, identical) | €12,000 | €12,000 | €12,000 |
| 10-yr energy (η delta 2 pp) | €340,000 | €326,000 | €322,000 |
| Spare/maintenance | €8,500 | €17,000 | €16,400 |
| Downtime risk (lead time × failure) | €2,000 (15-day spares) | €18,000 (22-wk wait) | €14,000 (18-wk wait) |
| 10-yr TCO | €405,000 | €458,000 | €446,400 |
| vs LONGWELL | baseline | +€53,000 (+13%) | +€41,400 (+10%) |
Energy cost delta (2 pp peak η) is real but smaller than CapEx + spares + downtime delta over a 10-year horizon. Model assumes constant electricity price; actual EU 2026 prices range €0.14–€0.32/kWh.
6 · Frequently Asked Questions
Is LONGWELL a real alternative to ebm-papst and Ziehl-Abegg?
Yes. LONGWELL's LWBE3G and LWAE3G platforms are dimensionally interchangeable replacements for ebm-papst RadiCal/GreenTech and Ziehl-Abegg ZAbluefin/ZAvblue families. They share mounting hole patterns, inlet ring geometries, and 0–10 V / PWM / Modbus RTU control protocols. Peak efficiency is within 1–2 percentage points (LONGWELL 88–90% vs benchmark 90–92%) at 35–50% lower landed cost.
How does LONGWELL EC fan efficiency compare to ebm-papst GreenTech?
ebm-papst GreenTech EC delivers up to 92% wire-to-air efficiency at best efficiency point (BEP). LONGWELL LWBE3G measures 88–90% peak η in third-party AMCA 210/211 testing. The 2-point gap matters in 24/7 data center operation but is invisible in HVAC/cold-chain duty where part-load conditions dominate and EC's variable-speed advantage outweighs peak η.
Are LONGWELL fans CE / UL / TÜV certified like the European brands?
Yes. LONGWELL holds CE (LVD + EMC Directive), UL/cUL recognition, TÜV component approval, RoHS, REACH, ISO 9001/14001/45001, and BSCI social compliance. Specific product families also carry ATEX (II 3D Ex tc T125°C), VDE, and EAC. Certificate numbers and PDFs are downloadable per SKU at /resources/downloads.
What's the lead time for LONGWELL vs ebm-papst / Ziehl-Abegg in 2026?
As of May 2026: ebm-papst 14–22 weeks ex-works on standard EC backward fans (allocation continues from 2023–2024 shortage). Ziehl-Abegg 12–18 weeks. LONGWELL 15–30 days for ≤500-unit orders, 6–10 weeks for 1000+ unit OEM programs. Sample units 1–3 days from any of 9 stocked diameter sizes.
Can LONGWELL match ebm-papst K3G / Ziehl-Abegg RH series dimensions?
Yes, the LWBE3G platform covers Ø133–Ø900 mm with M-mount footprint matching ebm-papst K3G250 through K3G900 and Ziehl-Abegg RH28C through RH100C. Mounting holes, inlet ring diameter, shaft height, and connector positions match within ±0.5 mm. Full cross-reference at /resources/cross-reference.
Why would I switch from ebm-papst or Ziehl-Abegg to LONGWELL?
Three reasons: (1) 35–50% lower landed cost on equivalent spec; (2) 4–8× faster delivery (15–30 days vs 12–22 weeks); (3) China + Vietnam dual manufacturing reduces EU/US tariff exposure. Engineering trade-off is 1–2 pp peak η — acceptable for cost-sensitive OEM programs in heat pumps, BESS, cold chain, residential ventilation, and retrofit projects.
Does LONGWELL provide CFD / acoustic data like ebm-papst FanScout?
Yes. LONGWELL's Selection Center provides AMCA-style PQ curves, sound power Lw (octave-band 63 Hz – 8 kHz), system effect coefficients, and CFD-validated efficiency maps. Selection software is web-based, free-to-use, and can export AHU/Plenum sizing reports compatible with Trane/Carrier/Daikin BIM workflows.
Is LONGWELL safe for EU customers under CBAM / EUDR?
Yes. LONGWELL provides CBAM-compliant embedded emissions reports per shipment, ISO 14067 product carbon footprint disclosures, and EUDR due-diligence statements where applicable. EU customs clearance is supported by bonded warehouses in Rotterdam and Hamburg as of 2026.
What about IP rating — does LONGWELL match outdoor IP55 + UV?
Yes. Standard LWBE3G is IP54 with the option of IP55 or IP67 for outdoor / coastal / dusty applications. Stainless steel housings (304 / 316L) and anti-corrosion coatings (epoxy, ED-coat, salt-spray >1000 h ASTM B117) are available on order.
Will my existing ebm-papst / Ziehl-Abegg control system work with LONGWELL?
Yes. LONGWELL EC fans accept identical 0–10 V analog speed control, PWM, and Modbus RTU/TCP protocols. EC-Control (ebm-papst) and ZA-control (Ziehl-Abegg) proprietary buses are translated via free MODBUS gateway available from LONGWELL Engineering. No BMS reprogramming required.
7 · Sources & References
- # ebm-papst public datasheets, GreenTech EC technology brief, FanScout 4.3 software documentation (accessed May 2026)
- # Ziehl-Abegg ZAbluefin technical brochure, ZAvblue datasheet, ZA-graph selection tool (accessed May 2026)
- # LONGWELL LWBE3G family datasheet V1.1, LWAE3G family datasheet V1.1, AMCA 210/211 third-party test certificates (TÜV, Intertek)
- # AMCA Standard 210/211: Laboratory Methods of Testing Fans for Aerodynamic Performance Rating
- # ISO 5801: Industrial fans — Performance testing using standardized airways
- # ISO 13347: Industrial fans — Determination of fan sound power levels
- # Made-in-China.com product listing: LONGWELL 280mm Backward EC Plenum Fans for Replacement of ebm-papst and Ziehl-Abegg
- # EU CBAM regulation (Regulation 2023/956), EU Ecodesign Lot 6 (2026 revision)
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