ImpellerØ250 mm9.8 in
Max airflow4,161.2 m³/h2,449 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

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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.

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.

Downloads for LWFA4D250-102DS-04

PDFDrawing · 659 KB PDFDatasheet · 670 KB

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

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
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.

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
LWA-250(10")U(S)M-01	28 m³/h	see curve	1,350 rpm	80 W	—	110-120 V	View
LWA-250(10")U(S)M-02	48 m³/h	see curve	2,800 rpm	230 W	—	110-120 V	View
LWDA-250S-MBN-10	1,034 m³/h	515 Pa	2,615 rpm	165 W	71 dB(A)	230 V	View
LWDA-250 (10")U-MWN-01	1,219 m³/h	see curve	3,000 rpm	228 W	69 dB(A)	110-120 V	View
LWDA-250 (10")U-MWN-03	1,219 m³/h	see curve	3,000 rpm	228 W	62 dB(A)	110-120 V	View
LWDA-250(8'')S-PWN-05	1,600 m³/h	420 Pa	2,500 rpm	175 W	50 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
LWDA-250 (10")S-MWN-02	1,900 m³/h	see curve	2,750 rpm	162 W	68 dB(A)	220-240 V	View
LWDA-250 (10")S-MWN-04	1,900 m³/h	see curve	2,750 rpm	162 W	60 dB(A)	220-240 V	View
LWFA-E-250-02	2,100 m³/h	215 Pa	—	—	64 dB(A)	—	View
LWA-250(10")U(S)M-03	2,100 m³/h	215 Pa	2,800 rpm	250 W	—	110-120 V	View
LWDA-250(10")S-MWN-06	2,100 m³/h	215 Pa	2,800 rpm	100 W	65 dB(A)	220 V	View
LWFA-E-250-01	2,500 m³/h	380 Pa	—	—	70 dB(A)	—	View