A belt-driven high-pressure centrifugal fan for furnace forced draft, industrial process air, material conveying and other duties where compact airflow must overcome substantial system resistance.
The 10-08-31 series includes No.6.9C and No.8C configurations with β₂ = 73° and β₂ = 90° impeller options. Published catalogue data cover fan speeds from 2950 to 4300 r/min and total pressure up to approximately 37.8 kPa.
For broader comparison across pressure-oriented fan families, see High-Pressure Centrifugal Fans .
High-Pressure Centrifugal Fan for Furnace Forced Draft and Process Air
The 10-08-31 is designed for pressure-oriented industrial air duties rather than general workshop ventilation. Its original technical documentation identifies high-pressure furnace air supply, material conveying, air conveying and clean industrial gas handling among its intended duties.
The catalogue describes the series as having relatively high efficiency, low noise, a smooth performance curve and a comparatively wide high-efficiency operating range. The fan is intended for non-corrosive, non-spontaneously combustible, non-explosive gas without sticky substances.
For complete system-level forced-draft selection, see Industrial Forced Draft Fan System & Selection .
High Pressure
Published total-pressure data reach approximately 37.8 kPa in the documented No.8C β₂ = 90° configuration.
Belt-Drive Flexibility
B-type belt transmission allows fan speed to be matched through the drive ratio rather than requiring motor speed to equal fan speed.
Compact Airflow
The series concentrates on relatively modest airflow with unusually high pressure for furnace, process-air and resistance-heavy duties.
No.6.9C and No.8C Performance Configurations
The 10-08-31 is not represented by one fixed operating curve. The supplied catalogue provides separate data for No.6.9C and No.8C, with β₂ = 73° and β₂ = 90° impeller outlet-angle variants.
No.6.9C
Published speeds: 2950 / 3600 / 4000 / 4300 r/min
B-type belt drive
Five V-belts
Belt inner circumference: 2000 mm
No.8C
Published speeds: 2950 / 3600 / 3800 r/min
B-type belt drive
Five V-belts
Belt inner circumference: 2000 mm
What does β₂ = 73° / 90° change?
The impeller outlet-angle variant changes the fan performance relationship between airflow, pressure and absorbed power. The correct β₂ configuration should therefore be selected from the required operating point rather than treated as a cosmetic construction option.
Performance Range for High-Pressure Industrial Air Duty
The summary below converts the catalogue airflow values into m³/h for easier international comparison. Final selection should still use the individual operating-point data for the chosen size, β₂ angle and fan speed.
Airflow, pressure, efficiency and power must be checked at the same operating point. For guidance, see How to Read a Fan Performance Curve .
B-Type Belt Drive for High-Speed Fan Operation
The documented 10-08-31 configurations use a B-type belt-driven arrangement. Fan speed is established through the motor, pulley combination and belt transmission rather than requiring the fan shaft to rotate at the motor's synchronous speed.
For a broader explanation of industrial centrifugal-fan drive layouts, see Centrifugal Fan Drive Arrangements: A, B, C, D, E and F Types .
B Type
Separate motor and fan shaft connected through belt transmission.
5 V-Belts
Original catalogue performance tables specify five V-belts.
2000 mm
Published nominal belt inner circumference for the documented configurations.
Outline and Installation Dimensions
The drawing below shows the representative No.8C belt-driven arrangement, including overall dimensions, fan shaft and bearing assembly, belt transmission, cooling-water reference, oil-level limits and foundation-bolt arrangement.
Furnace Forced Draft, Process Air and Material Conveying
Forging Furnace Forced Air
High-pressure combustion or process air for forging and furnace-related equipment.
High-Resistance Process Air
Industrial air systems where equipment and connected ductwork require substantially higher pressure than general ventilation fans provide.
Material Conveying
Pressure air for conveying duties where the conveyed material, abrasion level and system arrangement are confirmed during engineering review. For clean-air conveying design and system-resistance inputs, see the Industrial Pneumatic Conveying Air System.
Clean Industrial Gas
Suitable for non-corrosive, non-spontaneously combustible, non-explosive gas without sticky substances, subject to project review.
How to Select a High-Pressure Belt-Driven Centrifugal Fan
The 10-08-31 should not be selected from maximum pressure, motor power or model number alone. Airflow and required pressure must first be defined at the same operating point, followed by fan size, β₂ angle, fan speed, absorbed power and motor selection.
Airflow
Required operating airflow in m³/h or CFM.
Pressure
Confirm whether the project specifies total pressure or static pressure.
Configuration
Match No.6.9C or No.8C and β₂ = 73° or 90° to the duty point.
Fan Speed
Verify the required fan shaft speed and belt-drive ratio.
Motor
Check absorbed power, safety margin, voltage, frequency and motor construction.
For overseas projects, motor frequency and fan shaft speed must be reviewed separately because the fan uses belt transmission. See Motor Poles, RPM and 50Hz/60Hz Fan Speed .
Engineering Checks Before Final Fan Selection
Pressure Basis
Total pressure and static pressure must not be treated as interchangeable values.
Actual Gas Temperature
The catalogue performance data are referenced to 20°C inlet air. Actual project temperature must be supplied for density and construction review.
Material or Dust
Material properties, particle size, concentration and abrasiveness should be reviewed before confirming conveying duty.
Belt & Pulley Review
Pulley combination and belt transmission must match the selected fan speed and motor condition.
Bearings & Lubrication
The No.8C installation drawing identifies oil-level references and a cooling-water connection that must be considered in installation and maintenance planning.
Voltage & Frequency
Motor voltage, frequency and power can be reviewed for the destination market after the operating point is confirmed.
What to Send for a Reliable Fan Selection
Airflow
Static or total pressure
Continuous operating hours
Required operating margin
Gas temperature
Gas composition
Dust / material condition
Site altitude
Voltage and frequency
Available installation space
Inlet / outlet interfaces
Quantity
High-Pressure Belt-Drive Fan FAQ
What type of industrial duty is this fan intended for?
The original technical documentation identifies high-pressure furnace air supply, process air, material conveying and industrial gas delivery among its intended applications.
How much pressure can the fan produce?
The supplied catalogue data reach approximately 37.84 kPa total pressure in the No.8C β₂ = 90° configuration.
What airflow range is covered?
After normalization of the catalogue performance values, the documented series covers approximately 940 to 4,405 m³/h across the available configurations.
What is the difference between β₂ = 73° and β₂ = 90°?
They are different impeller outlet-angle variants with different airflow, pressure and absorbed-power characteristics. Selection should be based on the actual operating point.
Why is belt drive used?
Belt drive allows the required fan shaft speed to be obtained through the pulley ratio while keeping the motor mechanically separate from the fan shaft.
Can it be supplied for 400V, 415V, 440V or 60Hz projects?
Motor voltage, frequency and power can be reviewed according to the destination market and selected operating point. The belt-drive ratio must also be checked when the electrical frequency changes.
Can it be used for material conveying?
Material conveying is listed in the original application description, but particle size, concentration, abrasion and conveying arrangement must be reviewed before final selection.
Is 20°C the maximum allowable gas temperature?
No. The 20°C value shown in the source catalogue is the reference inlet-air condition for the published performance data, not a stated maximum allowable operating temperature. Actual gas temperature should be submitted for engineering review.
Send Airflow + Pressure Before Choosing the Configuration
Send airflow, pressure basis, gas temperature, medium condition, voltage, frequency and installation information. QIYUE FAN can review the suitable configuration, β₂ angle, fan speed, motor and belt-drive arrangement.
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