4-72 Centrifugal Fan
Applications
The 4-72 centrifugal fan is primarily used for indoor ventilation and air exchange in general large factories and large buildings, or for conveying air and other gases that are non-combustible, non-explosive, non-volatile, harmless to the human body, and non-corrosive to steel. The gases conveyed by the centrifugal fan must not contain viscous substances, and the dust and hard particles they contain must not exceed 150mg/m³, and the gas temperature must not exceed 80℃.
The performance, selected components, and foundation dimensions of the B4-72 fan are the same as those of the 4-72 fan, and can be selected by referring to its catalog. The fan construction is basically the same as that of the 4-72 fan. Models No2.8~6A use B35-type motors with flanges and feet. For models No6~12C and D, select the YB-series motor corresponding to the Y-series motor in the selection table; the installation type is B.
The F4-72 centrifugal fan is made of stainless steel, fiberglass-reinforced plastic, or other corrosion-resistant materials. Its performance and foundation dimensions are the same as those of the 4-72 centrifugal fan.
The F-72 centrifugal fan was among the earliest fans used in China, and is also one of the most widely used. From high-rise buildings to underground railways, from boiler forced-draft applications to workshop ventilation,
from the northern frontier to the shores of the South China Sea, and from the western plateau to the eastern border, 4-72 fans can be found everywhere.
Configurations
Viewed from the motor end, a fan whose impeller rotates clockwise is called a “right-hand fan” and is denoted by “right”; a fan rotating in the opposite direction is called a “left-hand fan” and is denoted by “left”.
The fan outlet position is indicated by the outlet angle of the casing. Users must specify the required position when placing an order. For models No2.8~ND6, the outlet position can be adjusted from 0° to 225° in 45° increments. For models No8~12, the outlet position can be adjusted from 0° to 225° in 45° increments. For models NO16 and 20, the outlet angle is fixed at one of three positions—0°, 90°, or 180°—and cannot be adjusted; the required position must be specified when ordering.
The fan has four drive types: A, B, C, and D. For the 4-72 fan, models No2.8~5 use a Type A drive; No6 is available with either a Type A or Type C drive; No8~12 use either a Type C or Type D drive; and No16~20 use a Type B drive.
If the above model numbers, drive types, or outlet angles do not meet your production requirements, our factory can modify or design the fan to meet your needs.
Performance and Selection
This catalog provides only the dimensionless performance table and dimensionless performance curve for the No10 test fan. Dimensional performance parameters for other model numbers can be derived from these.
Figure 1: 4-72 No10 Dimensionless Performance Table for the Test Fan The formulas for calculating dimensional parameters from dimensionless parameters are as follows:
Table 1: Dimensionless Performance Curve for the 4-72 No10 Test Fan
4-72 No2.8A, 3.2A, 3.6A Centrifugal Fan Performance and Component Selection Table
4-72 No3.6A, 4A, 4.5A Centrifugal Fan Performance and Component Selection Table
4-72 No4.5A, 5A, 6A Centrifugal Fan Performance and Component Selection Table
Fan Installation and Overall Dimensions
4-72-12, No2.8-6A Fan Installation and Overall Dimensions Table
4-72-12, No2.8-6A Centrifugal Fan Installation and Overall Dimensions Table
4-72 Centrifugal Fan Performance Selection Chart
4-72-3 Type A Centrifugal Fan Performance Selection Chart
4-72-2.8 Type A Centrifugal Fan Performance Selection Chart
4-72-3.5 Type A Centrifugal Fan Performance Selection Chart
4-72-3.2 Type A Centrifugal Fan Performance Selection Chart
4-72-4 Type A Centrifugal Fan Performance Selection Chart
4-72-4.5 Type A Centrifugal Fan Performance Selection Chart
4-72-5 Type A Centrifugal Fan Performance Selection Chart
4-72-6 Type A Centrifugal Fan Performance Selection Chart
Frequently Asked Questions
Yes. Selection should be based on the actual airflow, system resistance, conveyed medium, and installation conditions. Final performance is subject to the model data confirmed by Haitong and the technical documents for the order.
Haitong’s existing product information confirms that they are suitable for general ventilation and air conveyance, including ventilation in industrial plants, general exhaust, air supply for equipment, duct ventilation, and exhaust applications used with dust collection systems.
This can be evaluated based on the project's power supply conditions. However, a change in frequency affects the motor speed, airflow, pressure, and power, so the selection must be reviewed again for the required frequency.
They can be confirmed based on the selected model and project interfaces. Hightong’s existing product documentation confirms a circular inlet and rectangular outlet configuration. The final connection dimensions should be finalized using drawings or technical confirmation documents before production.
Haitong’s existing 4-72 product documentation lists the air outlet direction as customizable. The specific rotation direction and outlet angle should be confirmed based on the site layout, duct connections, and final model.
Can the 4-72 centrifugal fan be used in dust collection systems?
This should not be stated as a general claim. Fire smoke exhaust applications require specific temperature-resistance requirements, appropriate fan selection, and the inspection or certification documents required for the project. A standard 4-72 product page should not make claims about fire smoke exhaust performance.
We can assess the airflow, pressure, air outlet direction, motor configuration, interface dimensions, base, and related accessories based on project drawings. The final manufacturing scope is subject to the drawings and order technical documents confirmed by both parties.
Please provide the model, airflow, total/static pressure, installation orientation, air inlet and outlet configuration, material, insulation, motor voltage/frequency, control method, filter module, smoke control and fire protection requirements, quantity, and packaging requirements. Performance, dimensions, and certification information are subject to the confirmed product and order documents.
