LWFA4D250-138ST series dimensional drawing (shared by several models)

LWFA4D250-138ST series performance curve (shared by several models)

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 airflow3,399 m³/h2,001 CFM
Max static pressure391.4 Pa1.57 in. wg
Voltage380 V
Speed1,350 rpm
Input power850 W1.14 hp
Noise80 dB(A)

LWFA4D250-138ST-01 AC Single Inlet Forward Centrifugal Blower Ø250 mm

Ø250 mm | AC | Max airflow 3,399 m³/h | Max static pressure 391.4 Pa | 80 dB(A)

SKU: LWFA4D250-138ST-01 Categories: Centrifugal Fans, Impeller Ø160–315 mm, Single Inlet Forward Curved Blowers

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 dataPDFFull product catalogueAC AC Single Inlet Forward Centrifugal Blower · SKU on PDF p. 14

All files for LWFA4D250-138ST-015 files · direct download

PDFFull product catalogue · model on PDF p. 14 WEBPDimensional drawing WEBPPerformance curve PDFSeries catalogue

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

Solid-fuel heating Commercial dishwashers Commercial dryers Fan burners All industries →

Proven in projects

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

Get a quote · LWFA4D250-138ST-01

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WhatsApp / Phone+86 183 5827 4663 E-mail an engineersales@longwellfans.com Files for LWFA4D250-138ST-01datasheet · 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 →

Drawing & Curve LWFA4D250-138ST-01

LWFA4D250-138ST-01 Dimensional drawing — **Dimensional drawing**Dimensions in mm. Confirm against the final approval drawing before machining cut-outs.

LWFA4D250-138ST-01 Performance curve (P-Q) — **Performance curve (P-Q)**Static pressure vs. airflow. Curve numbers correspond to supply voltage / speed grades.

Files for LWFA4D250-138ST-01: datasheet, catalogue and drawing PDFs are listed above ↑ · CAD (STEP / DWG) on request — ask an engineer.

Technical description LWFA4D250-138ST-01

LWFA4D250-138ST-01 is a LONGWELL AC Single Inlet Forward Centrifugal Blower from the Single Inlet Forward Curved Blowers range, impeller Ø250 mm, rated 380 V AC, maximum airflow 3,399 m³/h, maximum static pressure 391.4 Pa, noise 80 dB(A), input power 850 W. The fixed-speed AC external-rotor motor is simple, robust and cost-effective for constant-duty applications.

Technical data

Model	LWFA4D250-138ST-01
Series	LWFA4D250
Motor type	AC
Phase	3-phase
Rated voltage	380 V
Frequency	50 Hz
Current	1.6 A
Input power	850 W
Speed	1,350 rpm
Max. airflow	3,399 m³/h
Max. static pressure	391.4 Pa
Noise	80 dB(A)
Ambient temperature	-30 ~ 60 °C
Impeller diameter	Ø250 mm
Rotor diameter	138 mm
Impeller material	Galvanised sheet steel
Insulation class	F
Bearing	Maintenance-free ball bearings
Duty	S1

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 LWFA4D250-138ST-01

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
LWFA4D250-138ST-01 this model	3,399 m³/h	391.4 Pa	1,350 rpm	850 W	80 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