EC Fan Alternative Guide

SKU-specific alternative pages for the most-deployed competitor models from ebm-papst (K3G plug · W3G axial · R3G residential · RadiPac FFU · D2E double-inlet), Ziehl-Abegg (RH plug · FN axial · ZAbluefin / ZAvblue premium winglet), Nicotra Gebhardt, Rosenberg, and Sanyo Denki. Each page contains side-by-side specs, compatibility verification, 2026 lead-time reality, and cost delta.

How to use this index: find the competitor model you're looking to replace. Each page shows the LONGWELL alternative SKU with side-by-side specifications, drop-in mounting compatibility, control protocol match, AMCA-tested efficiency comparison, and 2026 lead-time reality (15-day delivery LONGWELL vs 14–22 weeks ebm-papst, 12–18 weeks Ziehl-Abegg).

ebm-papst K3G (Backward-Curved EC Plug Fan) (18 models)

Premium German EC plug fan — global default for AHU/CRAH plug-fan installations.

Ø133 mm · RadiCal / K3G
K3G133LWBE3G-133-EC

Server cabinet ventilation and compact residential range-hood oem.

Ø175 mm · RadiCal / K3G
K3G175LWBE3G-175-EC

Premium range-hood oem with matter 1.2 smart kitchen integration.

Ø190 mm · RadiCal / K3G
K3G190LWBE3G-190-EC

Decentralized single-room erv retrofit (lunos-class) and small fan coil units.

Ø220 mm · RadiCal / K3G
K3G220LWBE3G-220-EC

Residential heat pump indoor fan coil and premium range hood retrofit.

Ø250 mm · RadiCal / K3G
K3G250LWBE3G-250-EC

Residential heat pump indoor coil and small ahu plug-fan installations.

Ø280 mm · RadiCal / K3G
K3G280LWBE3G-280-EC

280 mm rdhx fan supply for ai data center rear-door coolers and ffu modules.

Ø310 mm · RadiCal / K3G
K3G310LWBE3G-310-EC

Cold chain condensing unit and hybrid heat pump split outdoor section.

Ø355 mm · RadiCal / K3G
K3G355LWBE3G-355-EC

L2a liquid-to-air data center modules, in-row coolers, and 30–50 kw/rack rdhx.

Ø400 mm · RadiCal / K3G
K3G400LWBE3G-400-EC

Medium commercial ahu and bess container thermal management.

Ø450 mm · RadiCal / K3G
K3G450LWBE3G-450-EC

Large commercial ahu and crah fangrid retrofit with n+1 redundancy.

Ø500 mm · RadiCal / K3G
K3G500LWBE3G-500-EC

Hyperscale data center crah fangrid (tesla megapack bess spec, wärtsilä quantum reference).

Ø560 mm · RadiCal / K3G
K3G560LWBE3G-560-EC

Hyperscale crah fangrid 6×6 and 9-fan array configurations.

Ø630 mm · RadiCal / K3G
K3G630LWBE3G-630-EC

Cooling tower and large industrial process ahu duty.

Ø710 mm · RadiCal / K3G
K3G710LWBE3G-710-EC

Very large crah and industrial process exhaust applications.

Ø800 mm · RadiCal / K3G
K3G800LWBE3G-800-EC

Stadium and atrium hvac plus very large industrial ahu duty.

Ø900 mm · RadiCal / K3G
K3G900LWBE3G-900-EC

Mining ventilation and very large industrial process exhaust.

Ø1000 mm · RadiCal / K3G
K3G1000LWBE3G-1000-EC

Heavy mining ventilation and cement kiln induced-draft duty.

Ø1250 mm · RadiCal / K3G
K3G1250LWHV-1250-XL-EC

Mining main ventilation fans and tunnel + industrial mega-process duty.

ebm-papst W3G (Axial EC Fan) (12 models)

Premium German EC axial fan — for condenser, free cooling, heat pump outdoor unit.

ebm-papst R3G (Forward-Curved Residential/PHI) (5 models)

Premium residential EC blower — Passivhaus PHI component certified.

ebm-papst RadiPac (Pre-Assembled FFU/RDHx Module) (4 models)

Pre-engineered fan + filter + housing module for RDHx / L2A / data center.

ebm-papst D2E / D3G (Double-Inlet Forward-Curved) (3 models)

Double-inlet forward-curved blower — for FCU / ERV / dryer.

Ziehl-Abegg RH (Backward-Curved EC Plug Fan) (13 models)

Premium German EC plug fan — RH series, drop-in interchangeable with K3G at same size.

Ziehl-Abegg FN (Axial EC Fan) (6 models)

Premium German EC axial fan — FN series, for condenser, free cooling, heat pump.

Ziehl-Abegg ZAbluefin (Premium Winglet Plug) (4 models)

Premium acoustic winglet plug fan — best-in-class dB(A) for urban / hospital / acoustic-critical.

Ziehl-Abegg ZAvblue (Premium Winglet Axial) (3 models)

Premium acoustic winglet axial — for premium heat pump and quiet free cooling.

Nicotra Gebhardt (DDP / RDP / RLM) (4 models)

Italian EC plug fan — AHRI-certified, common in US AHU OEM specifications.

Rosenberg (GKHR / DRAE) (3 models)

German EC plug fan — common in EU AHU / RTU OEM and CRAH retrofit.

Sanyo Denki (San Ace) (3 models)

Japanese EC fan — JIS spec, for DCFC / BESS rack / Japan cold storage / fab FFU.

ebm-papst R3G (Backward-Curved Mid–Large AHU / Data Center) (8 models)

R3G is ebm-papst's primary backward-curved centrifugal line — mapped 1:1 to LONGWELL LWBE3G, including a GOLDEN MATCH (R3G560) and a field-validated retrofit case (R3G450).

Nicotra Gebhardt Commercial — Naming Mirror (AT / DD / RDH / RZR / ADH) (6 models)

LONGWELL's commercial centrifugal line is a 1:1 naming mirror of the Nicotra Gebhardt range — cross-reference by frame designation directly (AT 18/18 → AT 18-18L). Belt-drive or factory EC-upgrade.

Don't see your model?

Email sales@longwellfans.com with your competitor model number — verified equivalent + datasheet within 24 hours.
ebm-papst®, Ziehl-Abegg®, Nicotra Gebhardt®, Rosenberg®, and Sanyo Denki® are registered trademarks of their respective owners. LONGWELL is an independent manufacturer and is not affiliated with, endorsed by, or sponsored by these companies. Any references to third-party trademarks are used solely for identification and comparison purposes.