The 4-2×79 is a large-air-volume double-inlet centrifugal fan series with Type E belt drive. The available performance data covers fan sizes 8E through 20E for industrial ventilation and air-moving duties requiring high airflow with moderate total pressure.
Fan selection should be based on the required airflow, total pressure, gas density, system resistance and operating margin rather than fan size alone.
Built for Large Air Volume
The 4-2×79 uses a double-inlet centrifugal arrangement so air enters the impeller from both sides. This configuration is suited to applications where a single fan must handle a large air volume while maintaining the required system pressure.
The performance schedule uses Type E belt-drive configurations. Different rotational speeds and motor ratings are available within each fan size so the operating point can be matched to the project duty.
Performance Range by Fan Size
The table below summarizes the minimum and maximum published duty range for each 4-2×79 fan size.
Detailed Performance by Speed
Published operating ranges for Type E belt-drive configurations. Each row represents a specific rotational speed and recommended motor configuration.
Each row summarizes the minimum and maximum published duty-point values at the stated rotational speed.
Final fan and motor selection must be confirmed against the required airflow, total pressure, gas density, system resistance and operating margin.
Confirm Dimensions After Duty-Point Selection
The performance schedule covers several fan sizes, rotational speeds and motor configurations. Because the final arrangement depends on the selected fan size and drive configuration, installation dimensions should be checked against the project-specific outline drawing.
Preferred or existing fan size
Existing inlet and outlet connection dimensions
Available installation space
Existing motor power and speed, if replacing a fan
Rotation / discharge orientation requirements
Project voltage, frequency and phase
High-Volume Industrial Air-Moving Duties
Factory Ventilation
Large-volume supply or exhaust duties for industrial buildings.
Process Air
Air-moving systems where airflow and system resistance define the fan duty point.
Large Duct Systems
Centralized ventilation systems requiring high airflow through duct networks.
Replacement Projects
Existing large centrifugal fan replacement where duty and interface data can be supplied.
4-2×79 vs 4-2×72
Both are double-inlet centrifugal fan families, but they should not be treated as interchangeable model names. Selection should be made from the required operating point and project conditions.
8E–20E
13,520–438,000 m³/h
226–2,609 Pa
Type E belt drive
Select by Duty Point, Not Fan Size Alone
The 4-2×79 performance table includes multiple speeds for each fan size. Send the required operating conditions so the size, speed and motor can be reviewed together.
Required total or static pressure (Pa)
Gas type and operating temperature
Gas density or site altitude, if relevant
Duct/system resistance information
Required voltage / frequency / phase
Existing dimensions for replacement projects
Quantity and destination country
4-2×79 Double-Inlet Centrifugal Fan FAQ
What is the airflow range of the 4-2×79 fan?
Across the published 8E–20E performance data, airflow ranges from 13,520 to 438,000 m³/h.
What total pressure range is available?
The published operating points cover approximately 226 to 2,609 Pa depending on fan size and rotational speed.
Which fan sizes are included?
The available performance schedule covers 8E, 10E, 12E, 14E, 16E, 18E and 20E.
Is the 4-2×79 direct drive?
The performance data on this page is for Type E belt-drive configurations.
How should the correct speed be selected?
Match the required airflow and pressure to the published operating range, then verify gas density, system resistance, motor power and operating margin.
Can QIYUE FAN provide a project-specific motor?
Motor configuration can be reviewed according to the selected duty point and the project voltage, frequency and phase requirements.
Can this fan be used for replacement projects?
Replacement selection should include the existing fan duty, rotation, connection dimensions, installation space, motor data and any available drawings or fan nameplate information.
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