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

ImpellerØ400 mm15.7 in
Max airflow3,059 m³/h1,800 CFM
Max static pressure433 Pa1.74 in. wg
Voltage48 V
Speed1,260 rpm
Input power190 W
Noise73 dB(A)

LWBD3G400-102NH-03 DC Backward Curved Centrifugal Fan Ø400 mm

Ø400 mm | DC | Max airflow 3,059 m³/h | Max static pressure 433 Pa | 73 dB(A)

SKU: LWBD3G400-102NH-03 Categories: Backward Curved Centrifugal Fans, Centrifugal Fans, Impeller Ø400–560 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. 16

All files for LWBD3G400-102NH-034 files · direct download

PDFFull product catalogue · model on PDF p. 16 WEBPDimensional drawing WEBPPerformance curve

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 →

Get a quote · LWBD3G400-102NH-03

Price, curve check and lead time within 1 business day.

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WhatsApp / Phone+86 183 5827 4663 E-mail an engineersales@longwellfans.com Files for LWBD3G400-102NH-03datasheet · 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) LWBD3G400-102NH-03

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 48 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 LWBD3G400-102NH-03

LWBD3G400-102NH-03 Dimensional drawing — **Dimensional drawing**Dimensions in mm. Confirm against the final approval drawing before machining cut-outs.

LWBD3G400-102NH-03 Performance curve (P-Q) — **Performance curve (P-Q)**Static pressure vs. airflow. Curve numbers correspond to supply voltage / speed grades.

Files for LWBD3G400-102NH-03: datasheet, catalogue and drawing PDFs are listed above ↑ · CAD (STEP / DWG) on request — ask an engineer.

Technical description LWBD3G400-102NH-03

LWBD3G400-102NH-03 is a LONGWELL DC Backward Curved Centrifugal Fan from the Backward Curved Centrifugal Fans range, impeller Ø400 mm, rated 48 V DC, maximum airflow 3,059 m³/h, maximum static pressure 433 Pa, noise 73 dB(A), input power 190 W. The low-voltage brushless DC motor suits battery-powered equipment and electronics cooling with speed control on demand.

Technical data

Model	LWBD3G400-102NH-03
Series	LWBD3G400
Motor type	DC
Rated voltage	48 V
Current	4 A
Input power	190 W
Speed	1,260 rpm
Max. airflow	3,059 m³/h
Max. static pressure	433 Pa
Noise	73 dB(A)
Ambient temperature	-25 ~ 60 °C
Impeller diameter	Ø400 mm
Rotor diameter	102 mm
Impeller material	Sheet Aluminum
Protection class	IP44
Insulation class	F
Bearing	Maintenance-free ball bearings
Duty	S1
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 LWBD3G400: 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 LWBD3G400-102NH-03

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)