Centrifugal Fans, Backward Curved, Technical Features Overview
Higher Air Performance with Less Power Consumption
PBM's Backward Curved Centrifugal Fans, with aerodynamic impeller blades and a compact design, function as free wheel fans, offering optimized air output without the need for a scroll housing, and can be installed in any direction.
AC and DC power supply are available for entire range of fans with integrated and intelligence EC technology motor, with inside or outside mounted international standard remote control RS485 communication protocol.
That’s suitable to be adopted in IoE(Internet of Everything), IoT(Internet of Things), smart home system, Industry 4.0.and committed to Carbon Neutrality climate change by reducing customers carbon footprints.
PFC(Power Factor Correction), up to λ>96%, is optional for electricity grad stabilization compliance in certain circumstances of applications.ErP2015 (Energy-related Products) Directive conformity, COMMISSION REGULATION (EU) No 327/2011 of 30 March 2011 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to eco-design requirements for fans driven by motors with an electric input power between 125 W and 500 kW.
Impeller Sizes: from 133mm to 560mm diameter;
Sound Level: from 60dBA to maximum 82dBA according different rotation speed;
Airflow: maximum to 16,300CMH, Cubic Meter per Hour, equal to approx. 9,593CFM , Cubic Feet per Minute;
Air Pressure: Maxim to 1,700Pa, equal to 173.5mm H2O and to 6.82 inches H2O;
Power: Maximum motor input power goes to 3.1KW (equal to 4.2hp, horsepower) at motor diameter 138mm.
Application
High static pressure, low noise, clean airflow for IT & electronics. Reliable cooling for precision equipment and cleanroom environments.
Clean, reliable airflow for medical industry. Low noise, high stability for respiratory devices, cleanrooms, and medical cooling systems.
High static pressure, low energy, smooth operation for ventilation equipment. Ideal for commercial, industrial, and residential systems.
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![630mm EC-DC Backward Curved Centrifugal Fan PB3N630B4EO]()
630mm EC-DC Backward Curved Centrifugal Fan PB3N630B4EOPBM FOCUS ON EC FAN ONLY. Certificate: CE,UL,ROHS; Supply Ability: 100,000 pcs per year; MOQ: 1~100 pcs based on EXW price; 100 pcs above based on FOB price.
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![560mm EC-DC Backward Curved Centrifugal Fan PB3N560B4EA]()
560mm EC-DC Backward Curved Centrifugal Fan PB3N560B4EAPBM FOCUS ON EC FAN ONLY. Certificate: CE,UL,ROHS; Supply Ability: 100,000 pcs per year; MOQ: 1~100 pcs based on EXW price; 100 pcs above based on FOB price.
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![520mm EC-DC Backward Curved Centrifugal Fan PB3N520B4EP]()
520mm EC-DC Backward Curved Centrifugal Fan PB3N520B4EPPBM FOCUS ON EC FAN ONLY. Certificate: CE,UL,ROHS; Supply Ability: 100,000 pcs per year; MOQ: 1~100 pcs based on EXW price; 100 pcs above based on FOB price.
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![450mm EC-DC Backward Curved Centrifugal Fan PB3N450B4EF]()
450mm EC-DC Backward Curved Centrifugal Fan PB3N450B4EFPBM FOCUS ON EC FAN ONLY. Certificate: CE,UL,ROHS; Supply Ability: 100,000 pcs per year; MOQ: 1~100 pcs based on EXW price; 100 pcs above based on FOB price.
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![400mm EC-DC Backward Curved Centrifugal Fan PB3N400B4EB]()
400mm EC-DC Backward Curved Centrifugal Fan PB3N400B4EBPBM FOCUS ON EC FAN ONLY. Certificate: CE,UL,ROHS; Supply Ability: 100,000 pcs per year; MOQ: 1~100 pcs based on EXW price; 100 pcs above based on FOB price.
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![355mm EC-DC Backward Curved Centrifugal Fan PB3N355B4EP]()
355mm EC-DC Backward Curved Centrifugal Fan PB3N355B4EPPBM FOCUS ON EC FAN ONLY. Certificate: CE,UL,ROHS; Supply Ability: 100,000 pcs per year; MOQ: 1~100 pcs based on EXW price; 100 pcs above based on FOB price.
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![500mm EC-AC Backward Curved Centrifugal Fan PB3N500B4EM]()
500mm EC-AC Backward Curved Centrifugal Fan PB3N500B4EMPBM FOCUS ON EC FAN ONLY. Certificate: CE,UL,ROHS; Supply Ability: 100,000 pcs per year; MOQ: 1~100 pcs based on EXW price; 100 pcs above based on FOB price.
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![133mm EC-AC Backward Curved Centrifugal Fan PB3N133B2EH]()
133mm EC-AC Backward Curved Centrifugal Fan PB3N133B2EHPBM FOCUS ON EC FAN ONLY. Certificate: CE,UL,ROHS; Supply Ability: 100,000 pcs per year; MOQ: 1~100 pcs based on EXW price; 100 pcs above based on FOB price.
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![133mm EC-DC Backward Curved Centrifugal Fan PB3N133B24H]()
133mm EC-DC Backward Curved Centrifugal Fan PB3N133B24HPBM FOCUS ON EC FAN ONLY. Certificate: CE,UL,ROHS; Supply Ability: 100,000 pcs per year; MOQ: 1~100 pcs based on EXW price; 100 pcs above based on FOB price.
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![133mm EC-DC Backward Curved Centrifugal Fan PB3N133B24M]()
133mm EC-DC Backward Curved Centrifugal Fan PB3N133B24MPBM FOCUS ON EC FAN ONLY. Certificate: CE,UL,ROHS; Supply Ability: 100,000 pcs per year; MOQ: 1~100 pcs based on EXW price; 100 pcs above based on FOB price.
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![133mm EC-DC Backward Curved Centrifugal Fan PB3N133B24U]()
133mm EC-DC Backward Curved Centrifugal Fan PB3N133B24UPBM FOCUS ON EC FAN ONLY. Certificate: CE,UL,ROHS; Supply Ability: 100,000 pcs per year; MOQ: 1~100 pcs based on EXW price; 100 pcs above based on FOB price.
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![220mm EC-AC Backward Curved Centrifugal Fan PB3N220B2EM]()
220mm EC-AC Backward Curved Centrifugal Fan PB3N220B2EMPBM FOCUS ON EC FAN ONLY. Certificate: CE,UL,ROHS; Supply Ability: 100,000 pcs per year; MOQ: 1~100 pcs based on EXW price; 100 pcs above based on FOB price.
FAQ
Q: How do I choose the right backward curved centrifugal fan?
A: When selecting a backward curved centrifugal fan, buyers should evaluate:
● Required airflow (CFM or m³/h)
● Operating temperature
● Installation space
● Motor type (AC or EC motor)
● Noise requirements
● Environmental conditions such as humidity or dust exposure
For industrial projects, reviewing the fan performance curve is essential to ensure the fan operates efficiently within the system.
Q: What is the difference between AC and EC backward curved centrifugal fans?
A: AC backward curved centrifugal fans are widely used and cost-effective for standard industrial applications. EC backward curved centrifugal fans offer additional advantages such as:
● Higher energy efficiency
● Variable speed control
● Lower operating noise
● Intelligent control compatibility
● Longer lifespan
EC centrifugal fans are increasingly popular in modern HVAC systems, data centers, and energy-saving ventilation projects.
Q: Can backward curved centrifugal fans be customized?
A: Yes. Industrial backward curved centrifugal fans can often be customized based on project requirements, including:
● Voltage and frequency
● Airflow and pressure performance
● Impeller size
● Motor configuration
● IP protection level
● Speed control options
● Mounting structure
● Material selection for corrosive or high-temperature environments
Customized solutions are commonly required for OEM equipment manufacturers and industrial ventilation systems.
Q: What industries commonly use backward curved centrifugal fans?
A: Backward curved centrifugal fans are widely used in industries such as:
● HVAC and air handling systems
● Industrial ventilation
● Data centers
● Cleanrooms
● Refrigeration equipment
● Commercial kitchen ventilation
● Air purification systems
● Agricultural ventilation
● Electronic equipment cooling
Their ability to handle medium-to-high static pressure makes them suitable for demanding airflow environments.
Q: What is the difference between forward curved and backward curved centrifugal fans?
A: The main difference lies in blade design, airflow performance, and efficiency. Backward curved centrifugal fans use backward-inclined blades that provide higher efficiency, lower energy consumption, and better performance under medium-to-high static pressure conditions. Forward curved centrifugal fans are typically used for lower-pressure, high-volume airflow applications where compact size is important. Backward curved centrifugal fans are generally preferred in industrial ventilation systems, HVAC equipment, and air handling units because they offer:
● Higher operating efficiency
● Lower noise levels
● Reduced risk of motor overload
● Longer service life
● Better energy savings
Choosing between the two depends on airflow requirements, system resistance, installation space, and energy efficiency goals.
PBM Motor and Fan (Suzhou) Co., Ltd. is one of the most professional backward curved centrifugal fan manufacturers and suppliers in China, featured by quality products and good price. Please rest assured to buy customized backward curved centrifugal fan made in China here from our factory. Welcome to contact us for quotation.
