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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.

51 models meet 4,000 m³/h @ 700 Pa (2,354 CFM @ 2.81 in. wg) 43 with a curve in the library · 8 estimated from nameplate data · top 40 shown Air power at this point 778 WQ × Δp — no fan can draw less than this
00 3472235 6944469 10417704 13889939 173611173 Airflow m³/hStatic pressure Pa 4000 m³/h / 700 Pa
LWBE3G500-188NT-14LWBE3G500-188NT-10LWBE3G450-188NT-17LWFE3G355-188DS-01LWBE3G560-188NT-10LWFA-E-500-02LWBE3G630-188NT-09LWBA4D560-188NT-01solid = wind-tunnel measured · dashed = digitised catalogue curve
CompareModelMatchSpeed gradePressure at pointPaMarginMax airflowm³/hPowerW · nameplateNoisedB(A)VoltageVSizemmDataActions
LWBE3G500-188NT-14EC 100 1,700 rpm9 grades · 3 in reserve 788 13% 10,3051,90072400500 Digitised Curve
LWBE3G500-188NT-10EC 100 1,700 rpm9 grades · 3 in reserve 788 13% 13,4724,20066400500 Digitised Curve Datasheet
LWBE3G450-188NT-17EC 100 1,980 rpm9 grades · 4 in reserve 818 17% 8,6612,59585400450 Digitised Curve Datasheet
LWFE3G355-188DS-01EC 100 Grade 33 grades · 2 in reserve 769.3 10% 8,7991,70081380355 Digitised
LWBE3G560-188NT-10EC 99.9 1,410 rpm9 grades · 1 in reserve 768 10% 14,8792,42085400560 Digitised Curve Datasheet
LWFA-E-500-02AC 98.6 Grade 1Highest grade, no reserve 800.1 14% 11,000n/a82n/a500 Digitised
LWBE3G630-188NT-09EC 98.2 1,400 rpm5 grades · 2 in reserve 871.3 24% 21,7425,60075400630 Digitised Curve Datasheet
LWBA4D560-188NT-01AC 95.9 Grade 1Single grade 855.7 22% 13,2872,50085380560 Digitised Curve Datasheet
LWBA4D560-188NT-03AC 95.8 Grade 1Single grade 858 23% 11,3302,50085380560 Digitised Curve Datasheet
LWBE3G310-138PT-10EC 95.4 Grade 33 grades · 2 in reserve 743.5 6%tight 5,5931,58892400310 Digitised Curve Datasheet
LWBE3G310-138NT-25EC 95.4 Grade 33 grades · 2 in reserve 743.5 6%tight 5,592.91,58892400310 Digitised Curve
LWBE3G560-188PT-01EC 94.8 10 VHighest grade, no reserve 877.1 25% 16,0393,300n/a400560 Digitised Curve Datasheet
LWBE3G630-188NT-07EC 94.2 Grade 1Highest grade, no reserve 881.9 26% 21,1002,95585400630 Digitised Curve Datasheet
LWBE3G355-138PT-05EC 94.1 8 VHighest grade, no reserve 882.8 26% 7,0451,70081400355 Digitised Curve Datasheet
LWBE3G355-138PT-12EC 92.5 Grade 1Single grade 897.1 28% 6,2491,10077400355 Digitised Curve Datasheet
LWBE3G355-138NT-27EC 92.4 Grade 1Single grade 897.4 28% 6,2491,50077400355 Digitised Curve Datasheet
LWBE3G450-188NT-22EC 91.4 Grade 36 grades · 2 in reserve 742.5 6%tight 10,7522,40092380450 Digitised Curve Datasheet
LWFA-E-500-01AC 91 Grade 1Highest grade, no reserve 747.4 7%tight 8,380n/a75n/a500 Digitised
LWBE3G500-188PT-04EC 89.9 Grade 1Highest grade, no reserve 744.7 6%tight 14,2143,00089400500 Digitised Curve Datasheet
LWBA4D630-188NT-03AC 89 Grade 1Single grade 742.6 6%tight 17,9553,32086.9380630 Digitised Curve Datasheet
LWBE3G630-188PT-02EC 88.8 10 VHighest grade, no reserve 928.9 33% 21,1002,955n/a400630 Digitised Curve Datasheet
LWBE3G500-188NT-08EC 88.4 Grade 1Highest grade, no reserve 932.7 33% 14,2143,00089400500 Digitised Curve Datasheet
LWBE3G500-188NT-09EC 88.4 Grade 1Highest grade, no reserve 932.7 33% 12,2433,16078400500 Digitised Curve
LWBE3G355-188PT-26EC 87.1 6 V3 grades · 2 in reserve 996.9 42% 6,7563,10096380355 Digitised Curve Datasheet
LWFA6D500-188NT-01AC 87 Grade 1Single grade 737.6 5%tight 9,0644,40075380500 Digitised Curve
LWBA2D355-188NT-18AC 85 Grade 1Single grade 732.4 5%tight 5,9742,50090380355 Digitised Curve Datasheet
LWBE3G560-188NT-01EC 84.7 Grade 1Highest grade, no reserve 964.8 38% 16,0393,30063400560 Digitised Curve Datasheet
LWBA4D560-188NT-05AC 78.7 Grade 1Single grade 716.7 2%tight 13,1251,98083.9380560 Digitised Curve Datasheet
LWBE3G355-188NT-26EC 78.5 Grade 33 grades · 2 in reserve 1072.3 53% 8,0343,09096400355 Digitised Curve Datasheet
LWBE3G450-138NT-08EC 74.9 1,720 rpmHighest grade, no reserve 707.3 1%tight 7,82891075400450 Digitised Curve Datasheet
LWBE3G630-188PT-01EC 72.7 10 VHighest grade, no reserve 701.8 0%tight 19,2472,195n/a400630 Digitised Curve Datasheet
LWBE3G355-188PT-11EC 72.2 Grade 1Highest grade, no reserve 1074.9 54% 8,0343,09096400355 Digitised Curve Datasheet
LWBE3G500-188PT-02EC 60.3 Grade 1Single grade 1178.5 68% 12,2433,160n/a400500 Digitised Curve Datasheet
LWBE3G355-188NT-29EC 41 Grade 33 grades · 2 in reserve 1810.1 159% 6,7563,10096380355 Digitised Curve Datasheet
LWBE3G500-188PT-05EC 35.2 Grade 1Single grade 1398.6 100% 13,4724,20088400500 Digitised Curve Datasheet
LWBE3G630-188PT-04EC 35 Grade 1Single grade 1476.1 111% 21,7425,600n/a400630 Digitised Curve Datasheet
LWBE3G450-188PT-09EC 35 Grade 1Single grade 1987.1 184% 8,6612,595n/a400450 Digitised Curve Datasheet
LWBE3G450-188PT-07EC 35 Grade 1Single grade 1420.6 103% 7,4251,590n/a400450 Digitised Curve Datasheet
LWBE3G450-188PT-08EC 35 10 VSingle grade 1662.2 137% 8,0192,060n/a400450 Digitised Curve Datasheet
LWBE3G400-188PT-07EC 35 Grade 1Highest grade, no reserve 1467.5 110% 9,6822,06084400400 Digitised Curve Datasheet

“Measured” = wind-tunnel test data; “Digitised” = read from the catalogue curve, for pre-selection; “Estimated” = no curve in the library yet — the pressure at your airflow is estimated from the nameplate maxima with a conservative straight-line curve, so ask for the measured curve before finalising. 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 BlowersGas Blowers56 models

Burner and boiler air supply, premix and forced draft

Fan Coil UnitsFan Coil Units44 models

Chilled-water terminal units, exposed / concealed / cassette

Horizontal Concealed FCUHorizontal Exposed FCUVertical Concealed FCUVertical Exposed FCUCassette FCU
Explosion-Proof FansExplosion-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.

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