ImpellerØ355 mm14.0 in
Max airflow3,399 m³/h1,999 CFM
Max static pressure464 Pa1.86 in. wg
Voltage230 V
Speed1,400 rpm
Input power400 W
Noise72 dB(A)

LWBA4E355-138NS-13 AC Backward Curved Centrifugal Fan Ø355 mm

Ø355 mm | AC | Max airflow 3,399 m³/h | Max static pressure 464 Pa | 72 dB(A)

SKU: LWBA4E355-138NS-13 Categories: Backward Curved Centrifugal Fans, Centrifugal Fans, Impeller Ø250–355 mm

Factory direct
OEM / ODM
Samples in 1–3 days
Production 15–30 days
18-month warranty
CE · RoHS · ETL on request

Engineering files (on request)

CAD files exist for this model and can be released for assembly checks in SolidWorks / CATIA / Creo / Inventor.

STP3D model (STEP)15.8 MBRequest →

CAD models contain the blade geometry and are not downloadable. Tell us the project; an engineer sends the file after a short check, normally within 1 business day.

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WhatsApp / Phone+86 183 5827 4663 E-mail an engineersales@longwellfans.com Datasheet (PDF)electrical & performance data All files for LWBA4E355-138NS-13drawings · curves · datasheet

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100% tested · 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.

LWBA4E355-138NS-13 Dimensional drawing — **Dimensional drawing**Dimensions in mm. Confirm against the final approval drawing before machining cut-outs.

LWBA4E355-138NS-13 Performance curve (P-Q) — **Performance curve (P-Q)**Static pressure vs. airflow. Curve numbers correspond to supply voltage / speed grades.

LWBA4E355-138NS-13 Wiring diagram — **Wiring diagram**Lead colours and terminal assignment; TK = motor thermal contact.

Downloads for LWBA4E355-138NS-13

PDFDatasheet · 572 KB

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

LWBA4E355-138NS-13 is a LONGWELL AC Backward Curved Centrifugal Fan from the Backward Curved Centrifugal Fans range, impeller Ø355 mm, rated 230 V AC, maximum airflow 3,399 m³/h, maximum static pressure 464 Pa, noise 72 dB(A), input power 400 W. The fixed-speed AC external-rotor motor is simple, robust and cost-effective for constant-duty applications.

Technical data

Model	LWBA4E355-138NS-13
Series	LWBA4E355
Motor type	AC
Phase	1-phase
Rated voltage	230 V
Frequency	50 Hz
Current	2.2 A
Input power	400 W
Speed	1,400 rpm
Max. airflow	3,399 m³/h
Max. airflow (CFM)	1,999 CFM
Max. static pressure	464 Pa
Noise	72 dB(A)
Ambient temperature	-40 ~ 60 °C
Storage temperature	-40 ~ 80℃
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 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
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 LWBA4E355: 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 · 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
LWBA4E355-138NS-13 this model	3,399 m³/h	464 Pa	1,400 rpm	400 W	72 dB(A)	230 V
LWBA4E355-102NS-16	2,636 m³/h	410 Pa	1,425 rpm	203 W	69.9 dB(A)	230 V	View
LWBA4D355-102NT-06	2,812 m³/h	515 Pa	1,500 rpm	250 W	65 dB(A)	380 V	View
LWBA4D355-102NT-09	2,936 m³/h	464 Pa	1,380 rpm	200 W	65 dB(A)	380 V	View
LWBA4E355-102NS-07	2,936 m³/h	464 Pa	1,350 rpm	210 W	65 dB(A)	230 V	View
LWBA4E355-102NS-15	3,035 m³/h	546 Pa	1,635 rpm	268 W	73.8 dB(A)	230 V	View
LWBA4D355-102NT-10	3,245 m³/h	515 Pa	1,600 rpm	270 W	67 dB(A)	380 V	View
LWBA4E355-102NS-08	3,245 m³/h	515 Pa	1,550 rpm	280 W	67 dB(A)	230 V	View
LWBA4D355-138NT-11	3,399 m³/h	464 Pa	1,450 rpm	360 W	72 dB(A)	380 V	View
LWBA4E355-138NS-14	4,017 m³/h	618 Pa	1,700 rpm	600 W	77 dB(A)	230 V	View
LWBA4D355-138NT-12	4,017 m³/h	618 Pa	1,700 rpm	550 W	77 dB(A)	380 V	View
LWFA6D355-188NT-02	4,172 m³/h	412 Pa	900 rpm	1,150 W	70 dB(A)	380 V	View
LWBA2D355-188NT-17	4,635 m³/h	1,339 Pa	2,700 rpm	1,600 W	90 dB(A)	380 V	View
LWFA4D355-188NT-01	5,665 m³/h	906.4 Pa	1,340 rpm	3,500 W	80 dB(A)	380 V	View
LWBA2D355-188NT-18	5,974 m³/h	1,339 Pa	2,700 rpm	2,500 W	90 dB(A)	380 V	View