4-2×72 Double Inlet Centrifugal Fan

Double-Suction Fan for Centralized Air Handling

The 4-2×72 series should not be treated as a small general exhaust fan. Its double-inlet layout allows air to enter both sides of the impeller, so it is more suitable for projects where a large air volume needs to be handled through a centralized ventilation or air handling system.

Typical use cases include factory ventilation stations, workshop air exchange, large equipment air supply, process cooling air and centralized ducted ventilation. The final model should be checked according to airflow, pressure, speed, motor power, duct resistance and installation direction.

The standard conveyed medium is air or other non-flammable, non-toxic and non-corrosive gas without sticky substances. Dust and hard particles should not exceed 150 mg/m³, and the gas temperature should not exceed 80°C.

How the Double-Inlet Layout Works

Air Enters

One side of the impeller receives inlet airflow.

Double Intake

Air enters from both sides for large-volume operation.

Air Enters

The opposite inlet must also remain unobstructed.

High Airflow Discharge

The casing guides airflow toward the duct system.

Basic Configuration for 4-2×72 Selection

These values define the basic configuration and installation conditions that should be confirmed before final model selection.

Both Inlet Sides

Enough space should be reserved around both inlet sides to avoid airflow blockage.

Type E Transmission

Shaft, bearing housing, coupling and motor position should be reviewed together.

Duct Direction

Outlet angle should match the main duct route and reduce unnecessary resistance.

Maintenance Access

Bearing inspection, motor access and guard removal space should be confirmed before production.

Centralized Ventilation Rooms

Used where one fan station supports a larger air handling area.

Large Factory Air Exchange

Supports large-volume air exchange for industrial workshops and production halls.

Equipment Air Supply

Provides high air volume for process equipment and supporting air systems.

Process Cooling Air

Used when large airflow is required for cooling or air movement.

Ducted Air Handling Systems

Connected to large ducts where resistance and outlet angle must be reviewed.

Old Large Fan Replacement

Replacement based on old nameplate, shaft direction, outlet angle and installation space.

Send Your Double-Inlet Fan Parameters

Share airflow, total pressure, duct layout, medium, temperature, rotation direction, outlet angle, installation space, voltage and quantity. QIYUE FAN will review whether the 4-2×72 double inlet centrifugal fan fits your project.