Backward Curved SWSI FRP Centrifugal Fan – Wheel Type F – BCSF


Volume Capacity: 1,000~77,000m3/h m3/h (471 ~ 58,824 CFM)


Total Pressure: 100 ~ 4,000 Pa (0.4 ~ 16 in.WG.)


Operating Temperature: -20 ~ 450 ℃


Drive Type: Belt


Installation Methods: Plug


Applications: Industrial anti-corrosion exhaust, large volume air supply and exhaust, and explosion-proof air supply.


Optimized Design

The design of the backward curved centrifugal wheel is optimized through CFD simulation and conforms to the aerodynamic characteristics, ensuring low sound and smooth airflow.

Light Wheel and High Performance

Each wheel undergoes dynamic balancing tests and reaches G4.0 grade balancing level (whereas common products have only G6.3 level). This high balancing level has ensured the stable, durable and quiet operation of YFBCPR fans.

Wide Range of Performance and High Efficiency

Glass fiber reinforced plastics (FRP) is only about 1/4 of the weight of steel, so FRP wheel is lighter, and the shaft power required for starting is significantly reduced, thereby improving efficiency and reducing energy consumption. The expansion coefficient of FRP is smaller than that of the steel, so that the clearance between the air inlet and the wheel is reduced, which further improves the aerodynamic performance and reduces the turbulence.

High Quality FRP

The fan is made of glass fiber reinforced composite resin, a new composite material. It has the features of high strength, light weight and corrosion resistance. INFINAIR’s wheel resembles that of steel fans in terms of the mechanical performance, linear velocity reaching 78m/s. Different corrosion resistance formulations are added according to different corrosion characteristics of different gases to achieve better corrosion resistance performance.


High Strength

The structure of the fan is designed using FEA method, and uses a high-quality FRP with a relatively small thermal expansion coefficient. It is formed through molding for a stable structure and high strength.

Great Energy Efficiency

The fan adopts a backward wheel of high balancing level and great efficiency. The scroll and the inlet cone designed with the CFD flow field simulation, which helps make the fan efficiency above 69% and up to 90%, ensuring the efficient and energy-saving operation of the fan.

Excellent Air Tightness

The FRP seamless bonding technology is adopted for the fan scroll, and the shaft seal is added to prevent air leakage.

Excellent Corrosion Resistance 

BCSF glass FRP fan has much higher corrosion resistance levels than that of stainless steel fan. The service life is 6~7 times that of stainless steel fan in most applications. Among the parts that may have contact with corrosive gas, the scroll and access door are made of FRP. The metal parts are coated with FRP material and are not exposed to corrosive air. The shaft is provided with FRP sleeve.

High Reliability

The fan shaft is treated through hardening and tempering and finish turning processes. And the maximum load is 35% higher than that of the max RPM. The bearing is selected for a minimum (L-10) life in excess of 80,000 hours at maximum cataloged operating speed. The bearing is sealed and can be lubricated. The stable channel steel base supports the fan to ensure smooth operation of the fan.



Fan Type

The FRP anti-corrosion fan should be a single-inlet centrifugal fan of direct drive or belt drive. The fan should be able to resist strong corrosive gases such as strong acid, alkali and organic solvent. All parts that have contact with air should be treated with anti-corrosion treatment. The air inlet should have a smooth circular curved shape to ensure smooth air intake.

Quality Standards

Tests shall be performed on BCSF fans and certificates obtained under AMCA Standard 210 & 300. The manufacturer shall have the Production License for National Industrial Products and get the ISO9001 certification.


The scroll and wheel should be made of FRP. The structural resin content shall not be less than 50%. Different anti-corrosion properties should be added to the material depending on the gas. Under its designed operating conditions, the material does not change color or fall off.


The wheel should be of FRP backward centrifugal type and statically and dynamically balanced to the G4.0 as per AMCA 204 standard. After reaching the limit speed, it still maintains a smooth airflow and low noise. The blade design should ensure that performance degradation due to slippage at the operating point is effectively avoided. The appearance of the wheel should be even in color distribution, smooth in surface, free from defects such as cracks and burrs. Bubbles with a diameter of 3 mm or more are not allowed.


Made of FRP, the housing has its thickness and strength sufficient enough to withstand the maximum operating weight of the fan. The fan scroll shall adopt FRP seamless bonding technology to prevent air leakage. All metal parts in the scroll should be covered with at least two layers of 0.2mm FRP. The shaft hole shall not be larger than the diameter of the sleeve by 2 mm and the shaft seal shall be added.



The inlet shall conform to aerodynamics. It shall have streamlined design to allow for smooth airflow, less turbulence and low sound.

Drive Unit (for belt drive type)

Heat treated through soaking furnace, the shaft shall have its load designed at least 25% more than the maximum running speed of the fan. The FRP sleeve shall be added to the shaft and extend out of the housing for at least 10mm. The bearing box shall be used to support the shaft. The bearing is selected for a minimum (L-10) life in excess of 80,000 hours at maximum cataloged operating speed.


There shall be a close match between the motor and the fan load. The motor shall have a degree of protection standard IP54 and an insulation class F. To avoid corrosive air, the motor and drive unit shall be located out of the airstream to prolong service life.

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