Find by model
No model number? Select by duty point →

Select the right fan by duty point — from 2,600 LONGWELL models

Enter airflow and static pressure and get every model whose measured P-Q curve covers your operating point, ranked by pressure margin. Then download the drawing, curve and datasheet, and send an RFQ straight to the factory.

Measured wind-tunnel curvesDrawings, curves & datasheets per modelFactory RFQ, reply within 1 business dayISO 9001 · ETL · CE · RoHS

Know your airflow and static pressure? Get matching models instantly from 2,397 fans.

Every model with a measured P-Q curve is checked at your duty point: is the point under the curve, and how much static pressure margin remains? The ideal margin is 10–25% — too little and a dirty filter stalls the fan; too much and the fan runs off its efficient range.

61 models meet 4,000 m³/h @ 500 Pa (top 30 by match score) Air power at this point 556 WQ × Δp — no fan can draw less than this
00 3089214 6178427 9267641 12356855 154451068 Airflow m³/hStatic pressure Pa 4000 m³/h / 500 Pa
LWBE3G630-188PT-05LWBE3G560-188NT-10LWBE3G500-188NT-14LWBE3G500-188NT-10LWBE3G450-188NT-21LWFA-E-500-01LWBA4D500-188NT-02LWBE3G355-138NT-12solid = wind-tunnel measured · dashed = digitised catalogue curve
CompareModelMatchSpeed gradePressure at pointPaMarginMax airflowm³/hPowerW · nameplateNoisedB(A)VoltageVSizemmDataActions
LWBE3G630-188PT-05EC 100 Grade 23 grades · 1 in reserve 561.9 12% 19,1583,60085400630 Digitised Curve Datasheet
LWBE3G560-188NT-10EC 100 1,220 rpm9 grades · 3 in reserve 568.6 14% 14,8792,42085400560 Digitised Curve Datasheet
LWBE3G500-188NT-14EC 100 1,500 rpm9 grades · 4 in reserve 590.2 18% 10,3051,90072400500 Digitised Curve
LWBE3G500-188NT-10EC 100 1,500 rpm9 grades · 4 in reserve 590.2 18% 13,4724,20066400500 Digitised Curve Datasheet
LWBE3G450-188NT-21EC 100 1,560 rpm4 grades · 3 in reserve 555.3 11% 12,6474,60096380450 Digitised Curve Datasheet
LWFA-E-500-01AC 99.3 Grade 22 grades · 1 in reserve 635.6 27% 8,380n/a75n/a500 Digitised
LWBA4D500-188NT-02AC 98.6 Grade 1Single grade 570.5 14% 9,7851,50080380500 Digitised Datasheet
LWBE3G355-138NT-12EC 98 Grade 23 grades · 1 in reserve 625.2 25% 7,045.21,70081400355 Digitised Curve Datasheet
LWBE3G630-188NT-09EC 97.8 1,200 rpm5 grades · 3 in reserve 635.4 27% 21,7425,60075400630 Digitised Curve Datasheet
LWBE3G450-188PT-16EC 97.7 Grade 1Single grade 584.1 17% 8,9852,400n/a400450 Digitised Curve Datasheet
LWBA4D500-188NT-05AC 97.1 Grade 1Single grade 594 19% 9,3771,30081.9380500 Digitised Curve Datasheet
LWBE3G310-138PT-10EC 95.8 Grade 23 grades · 1 in reserve 638.5 28% 5,5931,58892400310 Digitised Curve Datasheet
LWBE3G310-138NT-25EC 95.7 Grade 23 grades · 1 in reserve 639.2 28% 5,592.91,58892400310 Digitised Curve
LWBE3G400-138PT-04EC 94.3 Grade 1Single grade 539.8 8%tight 7,4591,10077400400 Digitised Curve Datasheet
LWBE3G400-138NT-12EC 93.9 Grade 1Single grade 539.1 8%tight 7,4591,48071400400 Digitised Curve Datasheet
LWFA-E-450-02AC 93.7 Grade 1Single grade 538.8 8%tight 10,500n/a80n/a450 Digitised Curve
LWFE3G315-188DS-01EC 92.5 Grade 1Highest grade, no reserve 640.6 28% 8,7322,40081380315 Digitised
LWFA-E-500-02AC 92.1 Grade 22 grades · 1 in reserve 680.4 36% 11,000n/a82n/a500 Digitised
LWBE3G560-188PT-02EC 91 Grade 26 grades · 1 in reserve 657.5 31% 16,4802,77081400560 Digitised Curve Datasheet
LWBE3G560-188NT-09EC 91 1,230 rpm6 grades · 1 in reserve 657.2 31% 16,4802,77081400560 Digitised Curve Datasheet
LWBE3G630-188NT-06EC 90 Grade 1Highest grade, no reserve 656.5 31% 19,2472,19566400630 Digitised Curve Datasheet
LWBE3G500-188NT-08EC 88.8 Grade 23 grades · 1 in reserve 682.2 36% 14,2143,00089400500 Digitised Curve Datasheet
LWBE3G500-188NT-09EC 88.8 Grade 23 grades · 1 in reserve 682.2 36% 12,2433,16078400500 Digitised Curve
LWBE3G560-188NT-01EC 88.5 Grade 23 grades · 1 in reserve 524.2 5%tight 16,0393,30063400560 Digitised Curve Datasheet
LWBE3G450-138PT-04EC 83.8 Grade 1Highest grade, no reserve 695.3 39% 7,82891079400450 Digitised Curve Datasheet
LWBE3G630-188PT-02EC 82.8 8 V2 grades · 1 in reserve 508.6 2%tight 21,1002,955n/a400630 Digitised Curve Datasheet
LWBE3G560-188PT-08EC 82.8 Grade 56 grades · 4 in reserve 510.8 2%tight 19,7604,70091400560 Digitised Curve Datasheet
LWBE3G630-188PT-01EC 82.7 10 VHighest grade, no reserve 701.8 40% 19,2472,195n/a400630 Digitised Curve Datasheet
LWBE3G560-188NT-14EC 82.7 1,090 rpm6 grades · 4 in reserve 510.5 2%tight 19,7604,70091380560 Digitised Curve Datasheet
LWBA4D560-188NT-05AC 80.3 Grade 1Single grade 716.7 43% 13,1251,98083.9380560 Digitised Curve Datasheet

“Measured” = wind-tunnel test data; “Digitised” = read from the catalogue curve, for pre-selection. Power, noise and max airflow are nameplate values, not values at your duty point. Final selection is subject to duty-point verification and engineering confirmation.

Know the fan type you need? Enter the category and see its full parameter range.

Centrifugal Fans614 modelsHigh static pressure: AHU / RTU, CRAH, dust extraction Airflow155–23,896 m³/hPressure100–5,401 PaSize108–630 mm Axial Fans435 modelsHigh airflow, low–medium pressure: condensers, heat pumps, ventilation Airflow23–48,326 m³/hPressure60–3,690 PaSize145–1,000 mm Cross Flow Fans318 modelsLong even discharge: indoor AC units, air curtains Airflow23–4,000 m³/hPressure8–320 PaSize30–150 mm Inline Duct Fans125 modelsInline in ductwork: fresh air, exhaust, pressurisation Airflow140–7,100 m³/hPressure58–1,030 PaSize98–400 mm Cooling Fans & Blowers879 modelsElectronics and cabinet cooling, compact blowers Airflow2–4,800 m³/hPressure5–2,650 PaSize24–254 mm Commercial Centrifugal Blowers26 modelsDD / AT / RDH blowers for kitchens and process air Airflow139–11,000 m³/hPressure215–910 PaSize178–500 mm

Only know the application? Pick it below — each duty point is pre-verified against the library.

Not sure what airflow and static pressure to enter? Pick the closest application — every duty point below returns matching models from our measured library.

Air handling units

Fresh-air unit3,000 m³/h @ 400 PaPackaged AHU8,000 m³/h @ 600 PaLarge AHU12,000 m³/h @ 600 Pa

Data centers

Rack / micro-module2,000 m³/h @ 150 PaIn-row cooling6,000 m³/h @ 250 PaCRAH10,000 m³/h @ 300 Pa

Heat pumps & condensers

Residential heat pump3,000 m³/h @ 60 PaCommercial heat pump6,000 m³/h @ 120 PaCondenser bank12,000 m³/h @ 150 Pa

Cold rooms & cold chain

Chiller room +4 °C3,000 m³/h @ 100 PaFreezer room −18 °C5,000 m³/h @ 150 PaBlast freezer tunnel8,000 m³/h @ 300 Pa

Commercial kitchens

Extraction hood4,000 m³/h @ 500 PaMake-up air unit3,000 m³/h @ 250 Pa

Dust extraction

Cartridge collector6,000 m³/h @ 1200 PaWelding fume2,000 m³/h @ 1000 Pa

Factory ventilation

Roof exhaust15,000 m³/h @ 200 PaSpot cooling5,000 m³/h @ 300 Pa

Greenhouses

Circulation fan12,000 m³/h @ 50 PaPad exhaust18,000 m³/h @ 50 Pa

Poultry & livestock

Tunnel ventilation20,000 m³/h @ 30 PaMinimum ventilation5,000 m³/h @ 50 Pa

Display cabinets

Air-curtain cabinet800 m³/h @ 80 PaIsland cabinet1,500 m³/h @ 100 Pa

Cleanrooms

FFU1,000 m³/h @ 250 PaOperating-room AHU4,000 m³/h @ 700 Pa

Hotels

Concealed FCU600 m³/h @ 50 PaRoom fresh-air unit1,200 m³/h @ 150 Pa

Rail & marine

Vehicle ventilation2,000 m³/h @ 300 PaTunnel / platform exhaust15,000 m³/h @ 300 Pa

Cabinets & equipment

Cabinet fan500 m³/h @ 200 PaInverter cooling1,000 m³/h @ 150 Pa
2,616models
Ø24–1,000impeller size, mm
0–61kairflow, m³/h
849measured P-Q curves
2,316dimensional drawings

Browse by product line

Every category page is a selector for that fan type: filter by airflow, static pressure, voltage, size and motor, then compare in the data table.

Centrifugal FansCentrifugal Fans614 models

High static pressure: AHU / RTU, data-center CRAH, dust extraction

Backward Curved Centrifugal FansPlug Fans (RLM Plenum Fans)Single Inlet Forward Curved BlowersDual Inlet Forward Curved BlowersForward Curved Centrifugal Fans
Axial FansAxial Fans435 models

High airflow, low–medium pressure: condensers, heat pumps, ventilation

AC Axial FansEC Axial FansIndustrial Axial FansTube Axial FansDC Axial Fans
Cross Flow FansCross Flow Fans318 models

Even linear discharge, low noise: indoor AC units, air curtains

DC Cross Flow FansAC Cross Flow FansEC Cross Flow Fans
Inline Duct FansInline Duct Fans125 models

Metal / plastic / ultra-silent / mixed flow, inline in ductwork

Ultra Silent Duct FansMixed Flow FansMetal Inline Duct FansPlastic Inline Duct Fans
Cooling Fans & BlowersCooling Fans & Blowers879 models

Electronics and cabinet cooling, DC blowers, air knives

DC Axial Cooling FansDC Centrifugal BlowersAir Blowers (Air Knife / Air Pump)EC Cooling Fans
Commercial Centrifugal BlowersCommercial Centrifugal Blowers26 models

DD direct drive and LWFA series for kitchens and ventilation units

Impeller Ø280–500 mmImpeller Ø178–254 mm
Gas Blowers56 models

Burner and boiler air supply, premix and forced draft

Fan Coil Units44 models

Chilled-water terminal units, exposed / concealed / cassette

Horizontal Concealed FCUHorizontal Exposed FCUVertical Concealed FCUVertical Exposed FCUCassette FCU
Explosion-Proof Fans31 models

Ex-rated axial and centrifugal fans for hazardous areas

Poultry & Livestock FansPoultry & Livestock Fans30 models

Tunnel and minimum ventilation for barns and greenhouses

Motor Cooling FansMotor Cooling Fans30 models

Forced cooling for VFD-driven motors

Rail Transit FansRail Transit Fans11 models

Vehicle and platform ventilation

Exhaust FansExhaust Fans13 models

Wall and roof exhaust, floor dryers

Anti-Corrosion Fans4 models

PP / FRP fans for corrosive and humid air

How selection works here

Three steps from duty point to quotation — no login, no spreadsheet.

1Enter the duty pointAirflow and static pressure at the design condition. Use the application presets if you only know the use case.
2Check the curveEach result shows the speed grade that meets the point, the available pressure and the margin. 10–25% margin is ideal.
3Get files and quoteDownload the dimensional drawing, P-Q curve and datasheet. Add models to the RFQ list and submit once — an engineer replies within 1 business day.

Why buyers specify LONGWELL

Ningbo Longwell Electric Technology — HVACR fans and motors since 1990, exporting to 30+ countries.

The data is measured, not scaled

Six in-house laboratories produce every curve and noise figure on this site. Third-party test reports on request.

LONGWELL Wind-tunnel laboratoryWind-tunnel laboratoryAirflow – static pressure curves measured per AMCA 210 / 211 methods. This is the source of every performance figure on this site.LONGWELL Semi-anechoic chamberSemi-anechoic chamberSound power per AMCA 300 methods — every noise figure comes from here.LONGWELL High-temperature laboratoryHigh-temperature laboratoryContinuous running at elevated temperature verifies motor insulation class and bearing lubrication at the limit.LONGWELL Life testingLife testingBearing and complete-fan life tests supporting the L10 = 60,000 h design value.

Certificates you can verify by number

Management systems and product compliance per product line; scans of every original are on the certifications page.

ISO 9001 / 14001 / 45001BMCQ0222448M · BMCE0222279M · BMCS0222232MCE conformityEMC 2014/30/EU · LVD 2014/35/EUETL listed (North America)UL 507 + CSA C22.2 No. 113 · Intertek control no. 5022563RoHS · FCC · REACH · BSCI · CCCplus registered trademarks and design patents
Since 1990Ningbo Longwell Electric Technology Co., Ltd. — HVACR fans & motors, 36 years
30+ countriesOEM / ODM partner; offices in Russia (2022), Türkiye (2023) and Poland (2024)
2,616 models849 measured P-Q curves, drawings and datasheets online
Samples 1–3 daysproduction batches 15–30 days ex works Ningbo
Reply in 1 business dayengineer-checked quotation with curve and lead time

See the test labs, core technology and all certificate scans →

Send us the duty point and we do the selection

Airflow, static pressure, voltage, control mode and quantity — that is all our engineers need to propose the best-fit model with curve and lead time.

Ask an engineer   Download center
Scroll to Top
RFQ list