LWDD series dimensional drawing (shared by several models)

LWDD series performance curve (shared by several models)

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

ImpellerØ250 mm9.8 in
Max airflow1,236 m³/h727 CFM
Max static pressure577 Pa2.32 in. wg
Voltage24 V
Speed2,638 rpm
Input power130 W
Noise72 dB(A)

LWDD-250M-MBN-08 DC Metal Inline Duct Fan Ø250 mm

Ø250 mm | DC | Max airflow 1,236 m³/h | Max static pressure 577 Pa | 72 dB(A)

SKU: LWDD-250M-MBN-08 Categories: Impeller Ø160–315 mm, Inline Duct Fans, Metal Inline Duct Fans

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

PDFDatasheet (PDF)electrical & performance dataPDFFull product catalogueAC&DC&EC AC&DC&EC Metal duct fans · SKU on PDF p. 21

All files for LWDD-250M-MBN-084 files · direct download

PDFFull product catalogue · model on PDF p. 21 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

Building & agricultural ventilation Vertical farming All industries →

Proven in projects

Smart home ERV Range hoods, ovens & fan coils Drying, heat treatment & ovens All case studies →

Get a quote · LWDD-250M-MBN-08

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WhatsApp / Phone+86 183 5827 4663 E-mail an engineersales@longwellfans.com Files for LWDD-250M-MBN-08datasheet · 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) LWDD-250M-MBN-08

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 LWDD-250M-MBN-08

LWDD-250M-MBN-08 Dimensional drawing — **Dimensional drawing**Dimensions in mm. Confirm against the final approval drawing before machining cut-outs.

LWDD-250M-MBN-08 Performance curve (P-Q) — **Performance curve (P-Q)**Static pressure vs. airflow. Curve numbers correspond to supply voltage / speed grades.

Files for LWDD-250M-MBN-08: datasheet, catalogue and drawing PDFs are listed above ↑ · CAD (STEP / DWG) on request — ask an engineer.

Technical description LWDD-250M-MBN-08

LWDD-250M-MBN-08 is a LONGWELL DC Metal Inline Duct Fan from the Metal Inline Duct Fans range, impeller Ø250 mm, rated 24 V DC, maximum airflow 1,236 m³/h, maximum static pressure 577 Pa, noise 72 dB(A), input power 130 W. The low-voltage brushless DC motor suits battery-powered equipment and electronics cooling with speed control on demand.

Technical data

Model	LWDD-250M-MBN-08
Series	LWDD250
Motor type	DC
Rated voltage	24 V
Current	5 A
Input power	130 W
Speed	2,638 rpm
Max. airflow	1,236 m³/h
Max. static pressure	577 Pa
Noise	72 dB(A)
Impeller diameter	Ø250 mm
Inlet diameter	250mm
Impeller material	Plastic

Typical applications

Residential and commercial fresh-air systems
Kitchen and bathroom exhaust
Local pressurisation and booster duty
Hotel and office ventilation

Series LWDD250: 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.

Company certificates

Scans of original documents held by Ningbo Longwell Electric Technology Co., Ltd.: the company ISO 9001 / 14001 / 45001 management-system certificate. 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

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

How to order LWDD-250M-MBN-08

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)