Representative image of the series — dimensions and configuration of this model are given in the drawing and data table below.

ImpellerØ133 mm5.2 in
Max airflow386 m³/h230 CFM
Max static pressure335 Pa1.34 in. wg
Voltage24 V
Speed3,900 rpm
Input power28 W
Noise65 dB(A)

LWBD3G133-072NM-02 DC Backward Curved Centrifugal Fan Ø133 mm

Ø133 mm | DC | Max airflow 386 m³/h | Max static pressure 335 Pa | 65 dB(A)

SKU: LWBD3G133-072NM-02 Categories: Backward Curved Centrifugal Fans, Centrifugal Fans, Impeller Ø133–225 mm

Direct from LONGWELL
OEM / ODM
Samples in 1–3 days
Production 15–30 days
12-month warranty
CE · ETL · RoHS

PDFDatasheet (PDF)electrical & performance dataPDFFull product catalogueDC DC Backward centrifugal fans · SKU on PDF p. 7

All files for LWBD3G133-072NM-026 files · direct download

PDFFull product catalogue · model on PDF p. 7 WEBPDimensional drawing WEBPPerformance curve WEBPWiring diagram DOCXDatasheet

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

Air conditioning Air handling units FanGrid arrays FFU / EFU All industries →

Proven in projects

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

Engineering files (on request)

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

EXB2D drawing (CAXA EXB)3.2 MBRequest →

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

Get a quote · LWBD3G133-072NM-02

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WhatsApp / Phone+86 183 5827 4663 E-mail an engineersales@longwellfans.com Files for LWBD3G133-072NM-02datasheet · 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 →

Performance curve (P-Q) LWBD3G133-072NM-02

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 (1 here, rated 24 V). Data version: catalogue curve re-digitised 2026-09-20 (axis-calibrated, cross-checked). 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.

Drawing, Curve & Wiring LWBD3G133-072NM-02

LWBD3G133-072NM-02 Dimensional drawing — **Dimensional drawing**Dimensions in mm. Confirm against the final approval drawing before machining cut-outs.

LWBD3G133-072NM-02 Performance curve (P-Q) — **Performance curve (P-Q)**Static pressure vs. airflow. Curve numbers correspond to supply voltage / speed grades.

LWBD3G133-072NM-02 Wiring diagram — **Wiring diagram**Lead colours and terminal assignment; TK = motor thermal contact.

Files for LWBD3G133-072NM-02: datasheet, catalogue and drawing PDFs are listed above ↑ · CAD (STEP / DWG) on request — ask an engineer.

Technical description LWBD3G133-072NM-02

LWBD3G133-072NM-02 is a LONGWELL DC Backward Curved Centrifugal Fan from the Backward Curved Centrifugal Fans range, impeller Ø133 mm, rated 24 V DC, maximum airflow 386 m³/h, maximum static pressure 335 Pa, noise 65 dB(A), input power 28 W. The low-voltage brushless DC motor suits battery-powered equipment and electronics cooling with speed control on demand.

Technical data

Model	LWBD3G133-072NM-02
Series	LWBD3G133
Motor type	DC
Rated voltage	24 V
Voltage range	16-32
Current	1.17 A
Input power	28 W
Speed	3,900 rpm
Max. airflow	386 m³/h
Max. airflow (CFM)	230 CFM
Max. static pressure	335 Pa
Noise	65 dB(A)
Ambient temperature	-25 ~ 60 °C
Storage temperature	-40 ~ 75℃
Humidity	5 ~ 90 % RH
Altitude	< 1000m
Impeller diameter	Ø133 mm
Rotor diameter	72 mm
Impeller material	Propylene with glass-fiber reinforced( Impeller )
Protection class	IP42
Insulation class	B
Bearing	Maintenance-free deep groove ball bearings
Duty	S1
Balance grade	G6.3
Vibration standard	JB/T 8689
Service life	50,000Hours(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 LWBD3G133: 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.

Product-line certificates

Scans of original documents held by Ningbo Longwell Electric Technology Co., Ltd.: the company ISO management-system certificate and the certificates whose model list covers this model. 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

CE-LVD / CE-EMCVoluntary certificates of conformity issued by KTS; the covered models are listed on each certificate.

CE-LVD certificate of conformity KB230605L01 · LWBD3G — LONGWELL certificate

PDFCE-LVD certificate of conformity KB230605L01 · LWBD3G

CE-EMC certificate of conformity KB230605E01 · LWBD3G — LONGWELL certificate

PDFCE-EMC certificate of conformity KB230605E01 · LWBD3G

ETLIntertek Authorization to Mark, control no. 5022563; the covered model ranges are stated on the document.

ETL Authorization to Mark · report 230100446HAN-001 · LWAD3G / LWBD3G / LWFD3G / LWDD3G — LONGWELL certificate

PDFETL Authorization to Mark · report 230100446HAN-001 · LWAD3G / LWBD3G / LWFD3G / LWDD3G

Need a Declaration of Conformity for this model and your destination market? Ask us — we arrange additional certification on request.

How to order LWBD3G133-072NM-02

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 (Ø133 mm · DC)

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
LWBD3G133-072NM-02 this model	386 m³/h	335 Pa	3,900 rpm	28 W	65 dB(A)	24 V
LWFD3G133-072SZ-01	319 m³/h	319 Pa	2,100 rpm	65 W	59 dB(A)	310 V	View
LWFD3G133-072SH-01	319 m³/h	258 Pa	2,040 rpm	48 W	63 dB(A)	48 V	View
LWFD3G133-072SM-01	319 m³/h	258 Pa	2,040 rpm	48 W	63 dB(A)	24 V	View
LWBD3G133-072NH-03	386 m³/h	335 Pa	3,900 rpm	28 W	65 dB(A)	48 V	View
LWFD3G133-092DZ-02	679.8 m³/h	329.6 Pa	1,550 rpm	80 W	69 dB(A)	310 V	View
LWFD3G133-092DZ-01	679.8 m³/h	329.6 Pa	1,550 rpm	80 W	69 dB(A)	310 V	View
LWFD3G133-072DH-02	721 m³/h	515 Pa	1,780 rpm	105 W	62 dB(A)	48 V	View
LWFD3G133-072DM-02	721 m³/h	515 Pa	1,780 rpm	105 W	62 dB(A)	24 V	View
LWFD3G133-092DH-01	772.5 m³/h	293.55 Pa	1,750 rpm	110 W	66 dB(A)	48 V	View
LWFD3G133-092DM-01	772.5 m³/h	293.55 Pa	1,750 rpm	110 W	66 dB(A)	24 V	View
LWFD3G133-092DH-03	978.5 m³/h	484.1 Pa	1,560 rpm	120 W	68 dB(A)	48 V	View
LWFD3G133-092DM-03	978.5 m³/h	484.1 Pa	1,560 rpm	120 W	68 dB(A)	24 V	View
LWFD3G133-072DM-04	1,112.4 m³/h	597.4 Pa	1,580 rpm	118 W	64 dB(A)	24 V	View
LWFD3G133-072DH-04	1,112.4 m³/h	597.4 Pa	1,580 rpm	118 W	64 dB(A)	48 V	View