Representative image of the series — dimensions and configuration of this model are given in the drawing and data table below.

ImpellerØ250 mm9.8 in
Max airflow4,161.2 m³/h2,448 CFM
Max static pressure412 Pa1.65 in. wg
Voltage380 V
Speed1,250 rpm
Input power1,200 W1.61 hp
Noise77 dB(A)

LWFA4D250-102DS-04 AC Dual Inlet Forward Centrifugal Blower Ø250 mm

Ø250 mm | AC | Max airflow 4,161.2 m³/h | Max static pressure 412 Pa | 77 dB(A)

SKU: LWFA4D250-102DS-04 Categories: Centrifugal Fans, Dual Inlet Forward Curved Blowers, Impeller Ø180–355 mm

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

PDFDatasheet (PDF)electrical & performance data

All files for LWFA4D250-102DS-045 files · direct download

WEBPDimensional drawing WEBPPerformance curve WEBPWiring diagram PDFDrawing

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

Used in

Range hoods Air heaters Fan coil units Appliances 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.

EXB2D drawing (CAXA EXB)1.8 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 · LWFA4D250-102DS-04

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 LWFA4D250-102DS-04datasheet · 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) LWFA4D250-102DS-04

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 (1 here, rated 380 V). Data version: catalogue curve re-digitised 2026-09-20 (axis-calibrated, cross-checked). 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.

Drawing, Curve & Wiring LWFA4D250-102DS-04

LWFA4D250-102DS-04 Dimensional drawing — **Dimensional drawing**Dimensions in mm. Confirm against the final approval drawing before machining cut-outs.

LWFA4D250-102DS-04 Performance curve (P-Q) — **Performance curve (P-Q)**Static pressure vs. airflow. Curve numbers correspond to supply voltage / speed grades.

LWFA4D250-102DS-04 Wiring diagram — **Wiring diagram**Lead colours and terminal assignment; TK = motor thermal contact.

Files for LWFA4D250-102DS-04: datasheet, catalogue and drawing PDFs are listed above ↑ · CAD (STEP / DWG) on request — ask an engineer.

Technical description LWFA4D250-102DS-04

LWFA4D250-102DS-04 is a LONGWELL AC Dual Inlet Forward Centrifugal Blower from the Dual Inlet Forward Curved Blowers range, impeller Ø250 mm, rated 380 V AC, maximum airflow 4,161.2 m³/h, maximum static pressure 412 Pa, noise 77 dB(A), input power 1,200 W. The fixed-speed AC external-rotor motor is simple, robust and cost-effective for constant-duty applications.

Technical data

Model	LWFA4D250-102DS-04
Series	LWFA4D250
Motor type	AC
Phase	3-phase
Rated voltage	380 V
Frequency	50 Hz
Current	2.1 A
Input power	1,200 W
Speed	1,250 rpm
Max. airflow	4,161.2 m³/h
Max. airflow (CFM)	2,448 CFM
Max. static pressure	412 Pa
Noise	77 dB(A)
Ambient temperature	-30 ~ 60 °C
Storage temperature	-40 ~ 80℃
Humidity	0 ~ 85 % RH
Altitude	< 1000m
Impeller diameter	Ø250 mm
Rotor diameter	102 mm
Impeller material	Galvanised sheet steel ( Impeller )
Insulation class	F
Bearing	Maintenance-free ball bearings
Duty	S1
Balance grade	G6.3
Vibration standard	JB/T 8689
Service life	30,000Hours(L10), At 40 °Croom, humidity 15%~65%RH

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 LWFA4D250: 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.

Company certificates

Scans of original documents held by Ningbo Longwell Electric Technology Co., Ltd.: the company ISO 9001 / 14001 / 45001 management-system certificate. 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

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

How to order LWFA4D250-102DS-04

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 · AC)

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
LWFA4D250-102DS-04 this model	4,161.2 m³/h	412 Pa	1,250 rpm	1,200 W	77 dB(A)	380 V
LWBA4D250-092NT-19	855 m³/h	165 Pa	1,450 rpm	50 W	68 dB(A)	380 V	View
LWBA4E250-092NS-17	855 m³/h	165 Pa	1,400 rpm	50 W	68 dB(A)	230 V	View
LWBA4D250-092NT-20	1,004 m³/h	221 Pa	1,600 rpm	60 W	70 dB(A)	380 V	View
LWBA4E250-092NS-18	1,004 m³/h	221 Pa	1,600 rpm	60 W	70 dB(A)	230 V	View
LWBA2E250-092NS-12	1,185 m³/h	567 Pa	2,650 rpm	130 W	76 dB(A)	230 V	View
LWBA2D250-092NT-11	1,185 m³/h	773 Pa	2,600 rpm	185 W	76 dB(A)	380 V	View
LWBA2D250-092NT-15	1,421 m³/h	618 Pa	2,450 rpm	150 W	76 dB(A)	380 V	View
LWBA2E250-092NS-13	1,421 m³/h	618 Pa	2,500 rpm	155 W	76 dB(A)	230 V	View
LWBA2D250-092NT-16	1,499 m³/h	773 Pa	2,550 rpm	200 W	79 dB(A)	380 V	View
LWBA2E250-092NS-14	1,499 m³/h	773 Pa	2,600 rpm	210 W	79 dB(A)	230 V	View
LWFA6E250-102NS-04	1,751 m³/h	164.8 Pa	900 rpm	320 W	62 dB(A)	220 V	View
LWFA6D250-102NT-03	1,751 m³/h	164.8 Pa	910 rpm	320 W	62 dB(A)	380 V	View
LWFA4D250-138NT-01	2,369 m³/h	406.85 Pa	1,400 rpm	870 W	72 dB(A)	380 V	View
LWFA4E250-138NS-02	2,575 m³/h	401.7 Pa	1,330 rpm	900 W	72 dB(A)	220 V	View