The 4-2×72 is a double-inlet centrifugal ventilation fan designed for large airflow duties. The original catalogue covers No.6E through No.20E and includes performance tables, belt / pulley data and installation dimensions.
Catalogue applications include ventilation and air exchange for hotels, halls, theatres, workshops and other large spaces. Standard catalogue medium temperature is not more than 80°C, with sticky material excluded.
Final model, speed, motor, pulley arrangement, rotation, discharge angle and installation dimensions should be confirmed from the actual operating point and project layout.
Double-Suction Layout for Large Airflow With One Fan
The 4-2×72 uses a double-inlet structure, allowing air to enter the impeller from both sides. The series is therefore positioned for higher-volume ventilation duties than ordinary single-inlet general-purpose fan ranges.
The original catalogue documents No.6E, 8E, 10E, 12E, 14E, 16E, 18E and 20E. Larger sizes use correspondingly larger motors, belt / pulley sets and foundations.
Double-inlet does not mean that airflow alone determines the fan. The required total or static pressure, medium, temperature, installation space, outlet orientation and motor supply must still be checked together.
4-2×72 Series Technical Parameters
Standard Ventilation Duty and Special Review Conditions
Large-Volume General Ventilation
The catalogue positions the fan for ventilation and air exchange in large public or industrial spaces. Standard medium temperature is ≤80°C and sticky material is excluded.
High Temperature, Corrosive or Special Gas
Gas above 80°C, sticky material, corrosive service, explosive / combustible gas, abrasive dust or other process-specific conditions should not be assumed to fit the standard catalogue configuration.
Performance Coverage From No.6E to No.20E
The original performance tables cover eight model sizes and multiple speeds. The figures below describe the overall documented envelope rather than a single operating point.
Reference condition stated in the catalogue: 20°C, air density 1.2 kg/m³ and atmospheric pressure 101325 Pa.
| Item | Catalogue Range | Selection Meaning |
|---|---|---|
| Model Range | No.6E–No.20E | Eight documented double-inlet fan sizes. |
| Airflow | 9,460–422,000 m³/h | Large airflow range across all documented model / speed rows. |
| Total Pressure | 284–2,911 Pa | Pressure must be matched to the same airflow row. |
| Speed | 290–2000 r/min | Higher-speed small models and lower-speed large models are both covered. |
| Motor Power | 2.2–260 kW | Motor capacity changes with model, speed and duty point. |
| Model | Documented Speed Range | Documented Motor Range | Catalogue Notes |
|---|---|---|---|
| 6E | 920–2000 r/min | 2.2–22 kW | 90° / 180° belt-length references are listed. |
| 8E | 716–1630 r/min | 4–45 kW | Separate pulley and belt data by speed. |
| 10E | 580–1300 r/min | 7.5–75 kW | 90° / 180° belt-length references are listed. |
| 12E | 500–1160 r/min | 11–132 kW | High pressure points within the series occur in this size range. |
| 14E–20E | 290–830 r/min | 7.5–260 kW | Large-volume range with progressively larger pulley / motor arrangements. |
4-2×72 Outline and Installation Dimensions
The drawing below consolidates original catalogue geometry for the 4-2×72 family, including No.10E right 90° and the No.12E / 16E base-mounted arrangement. Final project dimensions must be confirmed against the selected model and discharge orientation.
Compact Double-Inlet Sizes
The original catalogue includes 90° and 180° outline / installation layouts for these sizes.
Right 90° Drawing
The engineering drawing shown above includes a documented No.10E right-90° arrangement.
Base-Mounted Layout
Original catalogue drawings include foundation, inlet / outlet and overall dimensions for these large sizes.
For drawing review and interface checking, see the Industrial Fan GA Drawing Guide.
Select the Double-Inlet Fan From the System Duty Point
Airflow
Required m³/h, m³/s or CFM. Large airflow is the main reason to consider a double-inlet configuration.
Pressure
Required static or total pressure at the same operating point.
Medium
Confirm gas condition, dust, corrosion, stickiness and any combustible / explosive risk.
Temperature
Normal and maximum gas temperature; standard catalogue duty is ≤80°C.
Motor & Transmission
Voltage, frequency, motor power, belt / pulley arrangement and available maintenance space.
Installation
Rotation, 90° / 135° / 180° discharge requirement, duct interface and foundation dimensions.
If airflow is known but system pressure is not, use the Static Pressure Unknown Guide and send duct dimensions, length, elbows, filters, dampers and other resistance information.
High-Volume Ventilation and Central Air-Handling Duties
Large Building Ventilation
High-volume supply or exhaust for halls, workshops, utility buildings and other large spaces.
Central Ventilation Systems
Large duct networks requiring one high-volume centrifugal fan.
Industrial Workshop Air Exchange
General supply / exhaust where a large airflow requirement makes a double-inlet fan practical. View Workshop Ventilation →
Process Air Handling
Large-volume process-air duty where pressure remains within the documented 4-2×72 range.
Drying / Circulation Systems
Large airflow circulation can be reviewed when actual inlet-gas conditions remain within the catalogue boundary. View Drying Oven Application →
Replacement Projects
Old fan nameplate, layout, pulley data, motor information and foundation dimensions can be used for replacement review.
4-2×72 Double Inlet Centrifugal Fan FAQ
Why use a double-inlet centrifugal fan?
A double-inlet arrangement allows air to enter the impeller from both sides and is therefore suited to high-volume ventilation duties where one fan must handle a large airflow.
What model range is documented in the original catalogue?
The supplied catalogue pages cover No.6E, 8E, 10E, 12E, 14E, 16E, 18E and 20E.
What is the catalogue airflow range?
Across the documented tables, the overall airflow range is approximately 9,460 to 422,000 m³/h. The matching pressure must always be taken from the same model and speed row.
What is the standard gas-temperature limit?
The original catalogue states that the medium temperature should not exceed 80°C for standard duty.
Can the outlet direction be customized?
The original dimensional pages show multiple orientations, including 90°, 135° and 180° examples. Final orientation should be confirmed with the selected size and project drawing.
What information should I send before quotation?
Send airflow, pressure, medium, temperature, outlet direction, voltage, frequency, quantity, installation space and any existing drawing or replacement information.
Send Airflow, Pressure and Installation Requirements
For 4-2×72 selection, send airflow, total or static pressure, medium, temperature, voltage, frequency, discharge orientation, quantity and destination. For replacement projects, attach the old fan nameplate, pulley / motor information, photos and available dimensions.
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