ImpellerØ355 mm14.0 in
Max airflow7,045.2 m³/h4,144 CFM
Max static pressure830.18 Pa3.33 in. wg
Voltage400 V
Speed2,700 rpm
Input power1,700 W2.28 hp
Noise81 dB(A)

LWBE3G355-138NT-12 EC Backward Curved Centrifugal Fan Ø355 mm

Ø355 mm | EC | Max airflow 7,045.2 m³/h | Max static pressure 830.18 Pa | 81 dB(A)

SKU: LWBE3G355-138NT-12 Categories: Backward Curved Centrifugal Fans, Centrifugal Fans, Impeller Ø250–355 mm

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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.

LWBE3G355-138NT-12 Dimensional drawing — **Dimensional drawing**Dimensions in mm. Confirm against the final approval drawing before machining cut-outs.

LWBE3G355-138NT-12 Performance curve (P-Q) — **Performance curve (P-Q)**Static pressure vs. airflow. Curve numbers correspond to supply voltage / speed grades.

LWBE3G355-138NT-12 Wiring diagram — **Wiring diagram**Lead colours and terminal assignment; TK = motor thermal contact.

Downloads for LWBE3G355-138NT-12

PDFDatasheet DOCXDatasheet · 572 KB

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LWBE3G355-138NT-12 is a LONGWELL EC Backward Curved Centrifugal Fan from the Backward Curved Centrifugal Fans range, impeller Ø355 mm, rated 400 V EC, maximum airflow 7,045.2 m³/h, maximum static pressure 830.18 Pa, noise 81 dB(A), input power 1,700 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	LWBE3G355-138NT-12
Series	LWBE3G355
Motor type	EC
Phase	3-phase
Rated voltage	400 V
Frequency	50 Hz
Current	2.8 A
Input power	1,700 W
Speed	2,700 rpm
Max. airflow	7,045.2 m³/h
Max. airflow (CFM)	4,144 CFM
Max. static pressure	830.18 Pa
Noise	81 dB(A)
Ambient temperature	-25 ~ 60 °C
Storage temperature	-25 ~ 70℃
Humidity	0 ~ 85 % RH
Altitude	< 1000m
Impeller diameter	Ø355 mm
Rotor diameter	138
Impeller material	Aluminum Alloy ( 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 °Croom, humidity 15%~65%RH
Speed control	Control input 0~10VDC / PWM/(RS485 external control box can be connected)
Control signal	Control signal VSP voltage range1±0.1VDC~9.5±0.2VDC(During normal operation, when the VSP voltage is below 1.0±0.1VDC, the motor switches from operating mode to standby mode)
PWM input	PWM signal: frequency 1K–10KHz, amplitude 10–12V,duty cycle 30%–70% .
Speed feedback	Tach output: 12 Pulse/R; FG internal open circuit output, external pull-up resistor 10KΩ, pull-up voltage +10V
Auxiliary output	Output 10VDC, Max Current 10 mA
Protection functions	Over-temperature protection, Over-current protection, Locked-rotor protection’
Soft start	Delay time <30 seconds to full speed
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 LWBE3G355: 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 (Ø355 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
LWBE3G355-138NT-12 this model	7,045.2 m³/h	830.18 Pa	2,700 rpm	1,700 W	81 dB(A)	400 V
LWBE3G355-092PS-15	2,472 m³/h	350 Pa	1,400 rpm	120 W	68 dB(A)	230 V	View
LWBE3G355-102PS-17	3,142 m³/h	670 Pa	1,900 rpm	330 W	77 dB(A)	230 V	View
LWBE3G355-102PS-16	3,554 m³/h	618 Pa	1,800 rpm	285 W	76 dB(A)	230 V	View
LWBE3G355-102PS-18	3,915 m³/h	770 Pa	2,050 rpm	423 W	74 dB(A)	230 V	View
LWFE3G355-102PS-09	4,171.5 m³/h	906.4 Pa	2,550 rpm	520 W	75 dB(A)	230 V	View
LWFE3G355-102PS-03	5,047 m³/h	1,009.4 Pa	2,200 rpm	700 W	85 dB(A)	230 V	View
LWBE3G355-138PT-20	5,356 m³/h	639 Pa	2,100 rpm	990 W	79 dB(A)	400 V	View
LWFE3G355-102PT-10	6,180 m³/h	1,751 Pa	2,550 rpm	1,100 W	86 dB(A)	400 V	View
LWBE3G355-138PT-12	6,249 m³/h	1,353 Pa	2,710 rpm	1,100 W	77 dB(A)	400 V	View
LWBE3G355-188PT-26	6,756 m³/h	2,524 Pa	3,800 rpm	3,100 W	96 dB(A)	380 V	View
LWBE3G355-188NT-29	6,756 m³/h	2,523.5 Pa	3,800 rpm	3,100 W	96 dB(A)	380 V	View
LWBE3G355-138PT-05	7,045 m³/h	830 Pa	2,700 rpm	1,700 W	81 dB(A)	400 V	View
LWBE3G355-188PT-11	8,034 m³/h	1,545 Pa	3,200 rpm	3,090 W	96 dB(A)	400 V	View
LWBE3G355-188NT-26	8,034 m³/h	1,545 Pa	3,200 rpm	3,090 W	96 dB(A)	400 V	View