Need a non-standard size or another format? Ask an engineer or search the download center.
- 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)
- Factory direct
- OEM / ODM
- Samples in 1–3 days
- Production 15–30 days
- 12-month warranty
- CE · RoHS · ETL on request
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
Proven in: Smart home ERV · Range hoods, ovens & fan coils · Drying, heat treatment & ovens — all case studies on longwellfans.com
Typical applications: Central ventilation units · Building & agricultural ventilation · Vertical farming — all industries
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.
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 |
Not sure which one? Send us the duty point (airflow / static pressure / noise limit) — use the selector or ask an engineer.
Other models in the LWDA400 seriesSame impeller, different speed grade or wiring
Adjacent sizesOne size up when airflow is short, one size down when it is too much
LWDE-355 (14")U-MWN-03Ø355 mm · 3,467 m³/h · ECadjacent size
LWDA-355 (14")S-MWN-04Ø355 mm · 6,450 m³/h · ACadjacent sizeLWDE-355 (14")S-MWN-04Ø355 mm · 6,200 m³/h · ECadjacent size
LWDA-355 (14")U-MWN-03Ø355 mm · 2,130 m³/h · ACadjacent size
LWDE-350 (14")S-MWN-02Ø350 mm · 6,200 m³/h · ECadjacent sizeLWDE-350 (14")U-MWN-01Ø350 mm · 3,467 m³/h · ECadjacent sizeAlternatives at a similar dutySimilar airflow, different construction or motor platform
See all Impeller Ø200–400 mm · select by duty point