ImpellerØ250 mm9.8 in
Max airflow3,811 m³/h2,243 CFM
Max static pressure742 Pa2.98 in. wg
Voltage380 V
Speed920 rpm
Input power655 W
Noise74 dB(A)

LWFE3G250-138DS-01 EC Dual Inlet Forward Centrifugal Blower Ø250 mm

Ø250 mm | EC | Max airflow 3,811 m³/h | Max static pressure 742 Pa | 74 dB(A)

SKU: LWFE3G250-138DS-01 Categories: Centrifugal Fans, Dual Inlet Forward Curved Blowers, Impeller Ø180–355 mm

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18-month warranty
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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. 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.

LWFE3G250-138DS-01 Dimensional drawing — **Dimensional drawing**Dimensions in mm. Confirm against the final approval drawing before machining cut-outs.

LWFE3G250-138DS-01 Performance curve (P-Q) — **Performance curve (P-Q)**Static pressure vs. airflow. Curve numbers correspond to supply voltage / speed grades.

LWFE3G250-138DS-01 Wiring diagram — **Wiring diagram**Lead colours and terminal assignment; TK = motor thermal contact.

Downloads for LWFE3G250-138DS-01

PDFDatasheet · 699 KB

Need a non-standard size or another format? Ask an engineer or search the download center.

LWFE3G250-138DS-01 is a LONGWELL EC Dual Inlet Forward Centrifugal Blower from the Dual Inlet Forward Curved Blowers range, impeller Ø250 mm, rated 380 V EC, maximum airflow 3,811 m³/h, maximum static pressure 742 Pa, noise 74 dB(A), input power 655 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	LWFE3G250-138DS-01
Series	LWFE3G250
Motor type	EC
Phase	3-phase
Rated voltage	380 V
Frequency	50 Hz
Current	1.2 A
Input power	655 W
Speed	920 rpm
Max. airflow	3,811 m³/h
Max. airflow (CFM)	2,242 CFM
Max. static pressure	742 Pa
Noise	74 dB(A)
Ambient temperature	-25 ~ 60 °C
Storage temperature	-25 ~ 70℃
Humidity	0 ~ 85% RH
Altitude	< 1000m
Impeller diameter	Ø250 mm
Rotor diameter	138
Impeller material	Galvanised sheet steel (Impeller)
Protection class	IP54
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℃room, 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 LWFE3G250: 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.

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
LWFE3G250-138DS-01 this model	3,811 m³/h	742 Pa	920 rpm	655 W	74 dB(A)	380 V
LWBE3G250-072PS-15	1,215 m³/h	391 Pa	2,150 rpm	90 W	68 dB(A)	230 V	View
LWDE-250 (10")U-MWN-01	1,219 m³/h	see curve	3,000 rpm	195 W	69 dB(A)	110-120 V	View
LWDE-250 (10")U-MWN-03	1,219 m³/h	see curve	3,000 rpm	195 W	62 dB(A)	110-120 V	View
LWDE-250S-MBN-07	1,231 m³/h	1,030 Pa	2,700 rpm	170 W	71 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
LWBE3G250-102PS-22	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
LWBE3G250-092PS-20	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
LWDE-250 (10")S-MWN-02	2,075 m³/h	see curve	3,000 rpm	195 W	69 dB(A)	220-240 V	View
LWDE-250 (10")S-MWN-04	2,075 m³/h	see curve	3,000 rpm	195 W	62 dB(A)	220-240 V	View
LWFE3G250-102PT-08	3,708 m³/h	1,751 Pa	3,860 rpm	1,000 W	92 dB(A)	400 V	View