Centrifugal Fans
01 · Airflow Principle
How an Industrial Centrifugal Fan Moves Air
Air enters near the center of the rotating impeller, gains velocity and pressure, and is discharged through the volute outlet. This makes centrifugal fans suitable for systems where airflow must overcome ducts, filters, dust collectors, boilers or process equipment resistance. For a complete introduction to fan structure, airflow direction and major components, see What Is a Centrifugal Fan? →
01
Air Inlet
Air enters near the impeller center.
02
Impeller Rotation
The wheel adds velocity to the airflow.
03
Pressure Increase
Velocity is converted into useful pressure.
04
Duct Outlet
Pressurized airflow enters the system.
02 · Working Condition
Choose a Centrifugal Fan by System Duty
Different series cover different airflow, pressure and operating conditions. Begin with the duty, then compare the appropriate fan family.
General Ventilation
4-72 / 4-68 / 4-79
Factories, workshops, warehouses, buildings and ordinary ducted air supply or exhaust.
Large Air Volume
4-2×72 Double Inlet
Centralized ventilation, large duct systems, process cooling and double-inlet air handling.
High Pressure
8-09 / 9-12 / 9-19 / 9-26 / 10-16
Furnace blowing, forced air, conveying and higher-resistance process systems.
Boiler / Gas Duty
Y6-30 / MJG
Boiler induced draft or project-selected industrial gas pressurizing applications.
03 · Complete Product Entry
Centrifugal Fan Product & Series Entry
The complete centrifugal fan entry below includes the current product pages and the high-pressure comparison hub already published on QIYUE FAN.
General Ventilation
4-72 Centrifugal Ventilation Fan
Factory ventilation, workshop exhaust and ordinary clean-air systems.
View 4-72 → 
Large Ventilation Range
4-68 Centrifugal Ventilation Fan
General air supply and exhaust with broad model and drive options.
View 4-68 → 
Indoor Air Exchange
4-79 Centrifugal Ventilation Fan
Indoor air supply and exhaust for factories, workshops and buildings.
View 4-79 → 
Double Inlet
4-2×72 Double Inlet Fan
Large-volume centralized ventilation and process air handling.
View 4-2×72 → View 4-2×79 → 
Furnace Blowing
8-09 High Pressure Fan
High-pressure furnace blowing and industrial gas conveying duty.
View 8-09 → 
High Resistance
9-12 High Pressure Fan
Long ducts, equipment resistance and high-pressure process air delivery.
View 9-12 → 
Pressure-First Duty
9-19 High Pressure Fan
Forced air, conveying and high-resistance industrial airflow systems.
View 9-19 → 
Higher Airflow + Pressure
9-26 High Pressure Fan
Heavy-duty forced airflow, conveying and high-resistance systems.
View 9-26 → 
Heavy-Duty High Pressure
10-16 High Pressure Fan
Furnace air supply, forced ventilation and material conveying.
View 10-16 → 
Boiler Induced Draft
Y6-30 Boiler ID Fan
Small and medium boiler flue gas extraction and negative-pressure support.
View Y6-30 → 
Gas Pressurizing
MJG Gas Booster Fan
Coal gas, coke oven gas and project-selected industrial gas boosting.
View MJG → Series Comparison Hub
High Pressure Centrifugal Fans
Compare 8-09, 9-12, 9-19 and 9-26 before final model selection.
Compare Series → 04 · Engineering Basics
Technical Checks Before Final Fan Selection
Start with the centrifugal fan fundamentals, then use the engineering guides below to connect the operating point with impeller geometry, drive arrangement, speed, fan curve and installation details.
Start Here · Centrifugal Fan Fundamentals
What Is a Centrifugal Fan?
Understand the basic structure, airflow path, impeller, casing, pressure generation and typical industrial uses before moving into detailed selection topics.
Fan Arrangement Types
Compare Arrangement 1, 3, 4, 7, 8, 9, 10 and SWSI / DWDI layouts.
Centrifugal Fan Blade Types
Forward-curved, radial and backward-curved impeller families.
Fan Laws
Understand how speed, diameter and density affect airflow, pressure and power.
Fan Performance Curve
Match airflow, pressure, absorbed power and duty point on the tested curve.
Motor Poles & Fan RPM
Review 50Hz / 60Hz speed, motor slip, VFD operation and fan RPM.
Rotation & Outlet Angle
Confirm CW/CCW rotation, outlet angle and installation direction before production.
05 · Selection Path
Centrifugal Fan Selection Is Not Model-Number Matching
01
Application
Ventilation · dust · boiler · process
02
Airflow
Required m³/h at the duty point
03
Pressure
Static / total pressure and resistance
04
Fan Series
Model family + mechanical configuration
Medium composition, temperature, dust condition, installation direction, motor requirement and actual duct resistance must also be checked before quotation.
06 · Typical Applications
Where Industrial Centrifugal Fans Are Used
Workshop Ventilation
Factory exhaust, air exchange and production-building ventilation.
View Application →Forced Draft
Combustion air, equipment air delivery and industrial forced airflow.
View Application →07 · FAQ
Centrifugal Fan Questions Buyers Often Ask
What is a centrifugal fan used for?
It moves air or industrial gas through systems where duct, filter or process resistance must be overcome, including ventilation, dust collection, boiler draft and process air delivery.
How do I choose a centrifugal fan?
Confirm application, airflow, static or total pressure, temperature, gas or dust condition, duct resistance, voltage, installation direction and quantity before selecting the series.
What is the difference between 4-72, 4-68, 9-19 and 9-26?
4-72 and 4-68 are general ventilation directions. 9-19 and 9-26 are reviewed for higher-pressure forced-air, conveying and high-resistance duties.
Which centrifugal fan is suitable for dust collection?
It depends on dust loading, collector resistance, particle condition and fan position. Dirty-side and clean-side fan selection should be reviewed differently.
Which fan is suitable for boiler induced draft?
Check flue gas temperature, dust content, total resistance and operating hours. Y6-30 and other boiler fan series can then be reviewed according to actual boiler duty.
What information is needed for quotation?
Application, airflow, pressure, temperature, medium, dust condition, duct layout, power supply, rotation, outlet direction, quantity and destination are the key inputs.
Centrifugal Fan Selection & Quotation
Send the Operating Point Before Choosing a Fan Series
Send the application, airflow, pressure, temperature, medium condition, duct resistance, voltage, rotation, outlet direction, quantity and destination. QIYUE FAN can review the suitable centrifugal fan family and configuration.
Request Fan Selection → Send Fan Requirements →Centrifugal Roof Exhaust Fan
High-Pressure and Process-Air Model Details
6-27 High-Pressure Centrifugal FanModel specifications, published performance and application selection.VIEW DETAILS →6-30 High-Pressure Process Air Centrifugal FanModel specifications, published performance and application selection.VIEW DETAILS →10-18 High-Pressure Centrifugal FanOriginal performance data, dimensional drawings and selection notes.VIEW DETAILS →9-28 I High-Pressure Centrifugal FanOriginal performance data, dimensional drawings and selection notes.VIEW DETAILS →10-08-31 High-Pressure Centrifugal FanOriginal performance data, dimensional drawings and selection notes.VIEW DETAILS →9-18 High-Pressure Centrifugal FanOriginal performance data, dimensional drawings and selection notes.VIEW DETAILS →9-16 High-Pressure Centrifugal FanOriginal performance data, dimensional drawings and selection notes.VIEW DETAILS →10-24 High Pressure Centrifugal FanOriginal performance data, dimensional drawings and selection notes.VIEW DETAILS →