ImpellerØ400 mm15.7 in
Max airflow2,500 m³/h1,471 CFM
Voltage110-120 V
Speed1,780 rpm
Input power440 W
Noise66 dB(A)

LWDA-400 (16″)U-MWN-03 AC Ultra Silent Metal Duct Fan Ø400 mm

Ø400 mm | AC | Max airflow 2,500 m³/h | 66 dB(A)

SKU: LWDA-400 (16")U-MWN-03 Categories: Impeller Ø200–400 mm, Inline Duct Fans, Ultra Silent Duct Fans

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

PDFRequest datasheetsent by an engineer within 1 business day

All files for LWDA-400 (16")U-MWN-031 files · direct download

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

Central ventilation units 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 · LWDA-400 (16")U-MWN-03

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WhatsApp / Phone+86 183 5827 4663 E-mail an engineersales@longwellfans.com Files for LWDA-400 (16")U-MWN-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 →

Dimensional drawing LWDA-400 (16")U-MWN-03

LWDA-400 (16")U-MWN-03 Dimensional drawing — **Dimensional drawing**Dimensions in mm. Confirm against the final approval drawing before machining cut-outs.

Files for LWDA-400 (16")U-MWN-03: datasheet, catalogue and drawing PDFs are listed above ↑ · CAD (STEP / DWG) on request — ask an engineer.

Technical description LWDA-400 (16")U-MWN-03

LWDA-400 (16")U-MWN-03 is a LONGWELL AC Ultra Silent Metal Duct Fan from the Ultra Silent Duct Fans range, impeller Ø400 mm, rated 110-120 V AC, maximum airflow 2,500 m³/h, noise 66 dB(A), input power 440 W. The fixed-speed AC external-rotor motor is simple, robust and cost-effective for constant-duty applications.

Technical data

Model	LWDA-400 (16")U-MWN-03
Series	LWDA400
Motor type	AC
Phase	1-phase
Rated voltage	110-120 V
Frequency	60 Hz
Input power	440 W
Speed	1,780 rpm
Max. airflow	2,500 m³/h
Noise	66 dB(A)
Impeller diameter	Ø400 mm
Inlet diameter	400mm

Typical applications

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

Series LWDA400: 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 LWDA-400 (16")U-MWN-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)

LONGWELL Semi-anechoic chamber — Semi-anechoic chamber

LONGWELL Test laboratory — Test laboratory

Test labs and all certificate scans →

Alternatives with the same impeller (Ø400 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
LWDA-400 (16")U-MWN-03 this model	2,500 m³/h	see curve	1,780 rpm	440 W	66 dB(A)	110-120 V
LWDA-400 (16")U-MWN-01	2,500 m³/h	see curve	1,780 rpm	440 W	75 dB(A)	110-120 V	View
LWDA-400 (16")S-MWN-02	7,100 m³/h	see curve	2,940 rpm	1,300 W	83 dB(A)	220-240 V	View
LWDA-400 (16")S-MWN-04	7,100 m³/h	see curve	2,940 rpm	1,300 W	71 dB(A)	220-240 V	View