ImpellerØ250 mm9.8 in
Max airflow3,708 m³/h2,181 CFM
Max static pressure1,751 Pa7.03 in. wg
Voltage380 V
Speed3,860 rpm
Input power1,000 W1.34 hp
Noise92 dB(A)

LWBE3G250-102NT-21 EC Backward Curved Centrifugal Fan Ø250 mm

Ø250 mm | EC | Max airflow 3,708 m³/h | Max static pressure 1,751 Pa | 92 dB(A)

SKU: LWBE3G250-102NT-21 Categories: Backward Curved Centrifugal Fans, Centrifugal Fans, Impeller Ø250–355 mm

Direct from LONGWELL
OEM / ODM
Samples in 1–3 days
Production 15–30 days
12-month warranty
CE · ETL · RoHS

PDFDatasheet (PDF)electrical & performance dataPDFFull product catalogueEC ( ) EC Backward centrifugal fans #2 · SKU on PDF p. 19

All files for LWBE3G250-102NT-215 files · direct download

PDFFull product catalogue · model on PDF p. 19 WEBPDimensional drawing WEBPPerformance curve WEBPWiring diagram

CAD models (STEP / DWG) are released on request — see “Engineering files” below. Another format or a non-standard variant? Ask an engineer · download center

Cross-reference: same impeller size class as ebm-papst K3G250, ebm-papst R3G250 — side-by-side comparison on longwellfans.com. Mounting is confirmed against the LONGWELL drawing before ordering.

Used in

Air conditioning Air handling units FanGrid arrays FFU / EFU All industries →

Proven in projects

AHU & ventilation unit fans CRAH FanGrid retrofit Heat pump fan programme All case studies →

Engineering files (on request)

CAD files exist for this model and can be released for assembly checks in SolidWorks / CATIA / Creo / Inventor.

STEP3D model (STEP)6.5 MBRequest →

CAD models contain the blade geometry and are not publicly downloadable. Tell us the project; an engineer sends the file after a short check, normally within 1 business day.

Get a quote · LWBE3G250-102NT-21

Price, curve check and lead time within 1 business day.

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WhatsApp / Phone+86 183 5827 4663 E-mail an engineersales@longwellfans.com Files for LWBE3G250-102NT-21datasheet · catalogue · drawings · curves — listed above

Samples 1–3 days · fee credited to your order
Typically 50–200 pcs · ~30 pcs for a first validation order
T/T 30 / 70 · FOB / CIF / DDP
Released to LONGWELL standards · 12-month warranty
How ordering works →

Performance curve (P-Q) LWBE3G250-102NT-21

Required airflow Required static pressure

Digitised from the catalogue curve at standard air (20 °C, 101.3 kPa, 1.2 kg/m³); one curve per voltage / speed grade (10 here, rated 380 V). Data version: catalogue 2026-08. The system resistance curve depends on the actual ductwork — confirm the operating point on site. Need an engineer to verify the duty point? Contact us or add the model to your RFQ and note the duty point.

Video LWBE3G250-102NT-21

Longwell 250mm EC Backward Curved Centrifugal Fan | High Efficiency & Quiet HVAC Motor LWBE3G250-102PS-28 · open in video library

Longwell EC Backward Inclined Centrifugal Fan: Quiet Efficiency, Smart Future | LWBE3G250-102NS-40 · open in video library

Drawing, Curve & Wiring LWBE3G250-102NT-21

LWBE3G250-102NT-21 Dimensional drawing — **Dimensional drawing**Dimensions in mm. Confirm against the final approval drawing before machining cut-outs.

LWBE3G250-102NT-21 Performance curve (P-Q) — **Performance curve (P-Q)**Static pressure vs. airflow. Curve numbers correspond to supply voltage / speed grades.

LWBE3G250-102NT-21 Wiring diagram — **Wiring diagram**Lead colours and terminal assignment; TK = motor thermal contact.

Files for LWBE3G250-102NT-21: datasheet, catalogue and drawing PDFs are listed above ↑ · CAD (STEP / DWG) on request — ask an engineer.

Technical description LWBE3G250-102NT-21

LWBE3G250-102NT-21 is a LONGWELL EC Backward Curved Centrifugal Fan from the Backward Curved Centrifugal Fans range, impeller Ø250 mm, rated 380 V EC, maximum airflow 3,708 m³/h, maximum static pressure 1,751 Pa, noise 92 dB(A), input power 1,000 W. The EC motor integrates the drive electronics: stepless speed control by 0–10 V or PWM signal, speed feedback and high efficiency at part load.

Technical data

Model	LWBE3G250-102NT-21
Series	LWBE3G250
Motor type	EC
Phase	3-phase
Rated voltage	380 V
Frequency	50 Hz
Current	1.6 A
Input power	1,000 W
Speed	3,860 rpm
Max. airflow	3,708 m³/h
Max. airflow (CFM)	2,181 CFM
Max. static pressure	1,751 Pa
Noise	92 dB(A)
Ambient temperature	-25 ~ 60 °C
Storage temperature	-40 ~ 80℃
Humidity	5 ~ 90 % RH
Altitude	< 1000m
Impeller diameter	Ø250 mm
Rotor diameter	102 mm
Impeller material	Aluminum Alloy ( Impeller )
Protection class	IP55
Insulation class	F
Bearing	Maintenance-free deep groove ball bearings
Duty	S1
Balance grade	G6.3
Vibration standard	JB/T 8689
Service life	40,000Hours(L10), At 40 °Croom, humidity 15%~65%RH
Rotation	Clockwise,seen on rotor

Typical applications

Air handling units (AHU) and rooftop units (RTU)
Data-center CRAH / CRAC units and fan walls
Dust extraction and process ventilation
Fan filter units and air purifiers

Series LWBE3G250: models in the same series share the impeller and motor platform and differ in speed grade, voltage or lead-out / terminal-box configuration — compare them in the table below or ask for the best fit at your duty point.

Nameplate values: maximum airflow is measured at zero static pressure and maximum static pressure at zero airflow; the two never occur together. Confirm the operating point on the performance curve. Final selection is subject to the duty point (airflow / static pressure / voltage / control mode) and project verification.

Product-line certificates

Scans of original documents held by Ningbo Longwell Electric Technology Co., Ltd.: the company ISO management-system certificate and the certificates whose model list covers this model. Click a scan to open the original.

ISO 9001 / 14001 / 45001Management systems of Ningbo Longwell Electric Technology Co., Ltd. (company certificate).

ISO 9001 / 14001 / 45001 management system certificate — LONGWELL certificate

PDFISO 9001 / 14001 / 45001 management system certificate

CE-LVDVoluntary certificates of conformity issued by KTS; the covered models are listed on each certificate.

CE-LVD certificate of conformity KB2206066L01 · LWBE3G — LONGWELL certificate

PDFCE-LVD certificate of conformity KB2206066L01 · LWBE3G

RoHSVoluntary certificate of conformity issued by KTS; the covered models are listed on the certificate.

RoHS certificate of conformity KB2206068R01 · LWBE3G — LONGWELL certificate

PDFRoHS certificate of conformity KB2206068R01 · LWBE3G

Need a Declaration of Conformity for this model and your destination market? Ask us — we arrange additional certification on request.

How to order LWBE3G250-102NT-21

Most first orders follow the same eight steps. Quantities, terms and lead times are confirmed in your quotation.

1SelectFind models by duty point in the selector or by model number, compare on the curve and add them to your RFQ list.
2Engineering checkWithin 1 business day you receive the duty-point check on the curve, price and lead time.
3SamplesStock models ship in 1–3 days.
4Validation supportDatasheets, drawings, wiring diagrams and DoC per model; test reports, CAD and register maps after a short project check or NDA.
5Order & paymentProforma invoice; first orders on T/T 30 / 70.
6Production & release15–30 days at the partner factory that builds your model, then inspected and released to LONGWELL standards with outgoing sampling to AQL 2.5.
7ShippingFOB / CIF / DDP by sea from Ningbo or Shanghai; express and air on EXW / FCA / DAP.
8After-sales12 months standard, extendable to 18–24 months by project agreement; test records retained for 5 years; 8D closed-loop for any issue; annual technical review for framework customers.

See terms, QC and FAQ →

Test & release at LONGWELL

Specified and drawn by LONGWELL; built to LONGWELL drawings by qualified partner factories; inspected and released to LONGWELL standards before shipment.

See test and release photos (8)

LONGWELL Semi-anechoic chamber — Semi-anechoic chamber

LONGWELL Test laboratory — Test laboratory

Test labs and all certificate scans →

Alternatives with the same impeller (Ø250 mm · EC)

Same impeller, different speed grade, power or wiring. Step up for more airflow, step down for lower noise.

Model	Max airflow	Max static pressure	Speed	Power	Noise	Voltage
LWBE3G250-102NT-21 this model	3,708 m³/h	1,751 Pa	3,860 rpm	1,000 W	92 dB(A)	380 V
LWBE3G250-072PS-15	1,215 m³/h	391 Pa	2,150 rpm	90 W	68 dB(A)	230 V	View
LWBE3G250-092PS-21	1,421 m³/h	556 Pa	2,600 rpm	170 W	69 dB(A)	230 V	View
LWBE3G250-072PS-17	1,421 m³/h	639 Pa	2,760 rpm	140 W	77 dB(A)	230 V	View
LWBE3G250-092NS-23	1,421 m³/h	556 Pa	2,600 rpm	170 W	69 dB(A)	230 V	View
LWBE3G250-102PS-22	1,524 m³/h	773 Pa	3,150 rpm	240 W	78 dB(A)	230 V	View
LWBE3G250-102NS-24	1,524 m³/h	773 Pa	3,150 rpm	240 W	78 dB(A)	230 V	View
LWBE3G250-092PS-16	1,531 m³/h	785 Pa	3,010 rpm	140 W	72.1 dB(A)	230 V	View
LWBE3G250-102PS-24	1,700 m³/h	1,082 Pa	3,500 rpm	370 W	82 dB(A)	230 V	View
LWBE3G250-102NS-26	1,700 m³/h	1,082 Pa	3,500 rpm	370 W	82 dB(A)	230 V	View
LWBE3G250-092PS-20	1,730 m³/h	525 Pa	2,500 rpm	145 W	74 dB(A)	230 V	View
LWBE3G250-092NS-22	1,730 m³/h	525 Pa	2,500 rpm	145 W	74 dB(A)	230 V	View
LWBE3G250-102PS-23	1,751 m³/h	824 Pa	3,170 rpm	270 W	84 dB(A)	230 V	View
LWBE3G250-102NS-25	1,751 m³/h	824 Pa	3,170 rpm	270 W	84 dB(A)	230 V	View
LWFE3G250-102PT-08	3,708 m³/h	1,751 Pa	3,860 rpm	1,000 W	92 dB(A)	400 V	View