External Rotor Fan Manufacturer โ Compact Motor-in-Impeller Design
External rotor motor fans integrate the motor inside the impeller hub โ higher efficiency, shorter installation depth, superior heat dissipation. Axial and centrifugal versions for refrigeration, condenser, and HVAC. ร172mmโร800mm.
- CE
- UL
- cUL
- RoHS
Browse External Rotor Fans by Specification
External rotor (outer rotor) motor fans put the rotor and impeller blades on a single rotating outer shell around a central stator โ giving ultra-short axial depth, direct rotor-to-air cooling, and very high efficiency. They are the workhorses of commercial refrigeration, heat pump condensers, and HVAC coils where shallow installation depth and 24/7 reliability are mandatory. Hongbo manufactures AC, EC, and DC versions, axial or centrifugal, from ร172mm to ร800mm, with anti-corrosion coatings for outdoor and coastal service. Custom wall rings, brackets, and retrofit kits for legacy ebm-papst / Ziehl-Abegg / Rosenberg models available.
External Rotor Fan Specifications Overview
All performance values measured per AMCA 210 / ISO 5801 in our calibrated airflow chamber. Download the full datasheet for installation drawings and certification documents.
| Type | Voltage (V) | Current (A) | Power (W) | Speed (RPM) | Airflow (m3/h / CFM) |
| YWF-250-5 | 220/230, 380/400 | 0.17 – 0.59 | 50 – 130 | 1400 – 2600 | 860 – 1500 / 500 – 1000 |
| YWF-300-5 | 220/230, 380/400 | 0.25 – 0.7 | 80 – 155 | 1350 – 2650 | 1650 – 2050 / 1000 – 1150 |
| YWF-350-5 | 220/230, 380/400 | 0.2 – 0.83 | 70 – 190 | 920 – 1550 | 1580 – 3000 / 920 – 1765 |
| YWF-400-5 | 220/230, 380/400 | 0.3 – 1.22 | 110 – 260 | 950 – 1620 | 2600 – 3900 / 1530 – 2200 |
| YWF-450-5 | 220/230, 380/400 | 0.31 – 1.2 | 135 – 280 | 910 – 1600 | 2900 – 4800 / 1705 – 2825 |
| YWF-500-5 | 220/230, 380/400 | 0.6 – 2.3 | 220 – 500 | 900 – 1500 | 4320 – 6800 / 2541 – 4000 |
| YWF-550-5 | 220/230, 380/400 | 0.95 – 3.3 | 280 – 725 | 900 – 1540 | 6500 – 8500 / 3823 – 5000 |
| YWF-600-5 | 220/230, 380/400 | 1.5 – 4.2 | 500 – 1000 | 910 – 1640 | 8500 – 11000 / 5100 – 6600 |
| YWF-630-5 | 220/230, 380/400 | 1.4 – 5.34 | 520 – 1150 | 900 – 1540 | 9300 – 11000 / 5600 – 6600 |
- Ultra-shallow axial installation depth
- Motor cooled directly by airflow
- Sickle-shaped blades for low noise
- AC, EC, and DC drive options
- Operating temp: -40ยฐC to +60ยฐC
- Anti-corrosion coating for outdoor use
- Dynamic balance to ISO 1940 G6.3
- Standard wall-ring mount compatible
Where Hongbo External Rotor Fans Are Used
Selected to deliver continuous-duty reliability across the industries where downtime is not an option.
ร172โ450mm axial fans for commercial fridges, walk-in coolers, and refrigerated transport โ IP55 anti-corrosion.
Quiet, low-temperature-rated external rotor fans for residential and commercial heat pumps.
Slim-profile fans for supermarket refrigeration, vertical display cases, and beverage coolers.
ร350โ630mm fans for split AC outdoor units, VRF systems, and rooftop packaged units.
Industrial dry coolers and oil coolers โ high-airflow, low-pressure design for finned-coil applications.
Large-diameter ร630โ800mm fans for greenhouse, livestock barn, and grain dryer ventilation.
What Our Clients Say
Coastal humidity corroded their previous fans. Our anti-corrosion HB-ER300 ran 4 years near the sea with no corrosion failures.
Cold Room OEM
Refrigeration Equipment | Spain
Heat pumps needed reliable start at -30ยฐC. Our cold-rated HB-ER350 started and ran through Nordic winters without issue.
Heat Pump Manufacturer
HVAC Equipment | Sweden
A service company needed replacements for discontinued ebm-papst units. We cross-referenced and supplied dimensional drop-ins.
Service Parts Distributor
Refrigeration Maintenance | Germany
Why Manufacturers Choose Hongbo Motor
External rotor (outer rotor) motor fans put the rotor and impeller blades on a single rotating outer shell around a central stator โ giving ultra-short axial depth, direct rotor-to-air cooling, and very high efficiency. They are the workhorses of commercial refrigeration, heat pump condensers, and HVAC coils where shallow installation depth and 24/7 reliability are mandatory. Hongbo manufactures AC, EC, and DC versions, axial or centrifugal, from ร172mm to ร800mm, with anti-corrosion coatings for outdoor and coastal service. Custom wall rings, brackets, and retrofit kits for legacy ebm-papst / Ziehl-Abegg / Rosenberg models available.
In-house motor winding, die-casting, injection molding, and assembly in Zhejiang. Monthly capacity 800,000+ units across the external rotor fan line.
Anechoic chamber, calibrated airflow chamber, 100% Hi-POT testing, ISO 1940 G6.3 rotor balance on every batch.
CE ยท UL / cUL ยท TรV ยท RoHS ยท REACH ยท EAC ยท ISO 9001:2015. Certified for NA, EU, Japan, and SE Asia.
In-house tool shop for custom frames and impellers. DFM review, 3D modeling, and prototypes within 7โ10 days.
Stock models ship in 7 days. Custom orders 25โ35 days for volume. Real-time production photos and QC reports.
Active supplier to OEMs across HVAC, telecom, power, and medical in Germany, USA, India, Turkey, Brazil and beyond.
Our Production Environment
We are factory direct sales, from consumers to stores to wholesalers to agents to general distributors to factory merchants,ย choose us to save a lot of intermediate links, to bring you the maximum profit margin!
Frequently Asked Questions
No fixed MOQ. We accept orders of any size โ from a few pieces for prototyping up to container-scale volume production. Many long-term customers start with a small trial order of External Rotor Fans to validate fit before scaling up. Tell us your quantity and we’ll quote accordingly.
Yes โ samples are free. You only cover the courier cost (typically $30โ60 via DHL/FedEx, 3โ5 days door to door). Standard-model samples dispatch within 7 days of your request so you can evaluate real performance before committing.
We accept T/T (telegraphic transfer / bank wire). For new orders the standard arrangement is a deposit with the balance before shipment; exact split is confirmed on the proforma invoice. Terms can be discussed for established repeat customers.
All Hongbo External Rotor Fans carry a 24-month warranty from the shipment date. Verified manufacturing defects are replaced free of charge in your next shipment or credited. Our field return rate is below 0.5%, and we run full root-cause analysis on any batch-level issue.
Standard models ship from stock within 7 days. Bulk orders of 5,000โ20,000 units take 25โ35 days. We confirm a firm ship date on the proforma invoice and send production progress photos at the midpoint of manufacturing.
Yes. You’re welcome to send BV, SGS, TรV, or your own QC team to inspect before shipment. We also provide our own AQL 1.0 inspection report and 100% Hi-POT test records with every shipment at no extra charge.
Three: (1) motor inside the impeller hub means much shorter axial depth โ critical for HVAC/refrigeration; (2) the rotating outer surface is cooled directly by airflow, no separate heatsink; (3) impeller-and-rotor as one unit reduces vibration and losses, raising efficiency.
Yes โ standard models are IP54/IP55. Anti-corrosion coatings (epoxy/e-coat) and stainless components are available for coastal, chemical, and marine environments.
Yes โ our most popular product for new HVAC, heat pump, and refrigeration designs, combining external-rotor structure with 0โ10V/PWM/Modbus control and 70%+ efficiency. See ourย EC Fanย page.
Yes โ replacement impellers, motor sub-assemblies, and full retrofit kits for many legacy ebm-papst, Ziehl-Abegg, and Rosenberg models. Send your old part number for a cross-reference quote.
Yes โ standard wall-ring mounts (short/long nozzle), vibration-isolation brackets, and finger guards for every standard size. Custom brackets routinely made for OEM.
Your OEM Order, Step by Step
From first inquiry to shipped goods. Most customers move from spec to sample in under two weeks.
Contact Information
Share your fan size, voltage, airflow target and order quantity. Hongbo will reply with model suggestions, pricing and sample information.
sales@growwinco.com
86-13917731369, 86-19921915162
86-13917731369
6~8th Floor, No. 1988 Dongfang Road, Pudong Area, Shanghai 200120
Send Your Inquiry
If you have any questions, please do not hesitate to contact us.
