The 4-79 centrifugal ventilation fan is positioned for indoor air supply, exhaust and large-volume air exchange across factories, workshops, warehouses, machinery rooms and other large industrial spaces. The documented series extends from small direct-drive No.3A units through large No.20E configurations.
Standard catalogue duty is for air or other non-corrosive gas without sticky material. Dust and hard-particle content should not exceed 150 mg/m³, and gas temperature should not exceed 80°C.
Final model, speed, motor, transmission arrangement, rotation, discharge position and installation dimensions should be confirmed from the actual duty point.
Indoor Air Supply & Exhaust Across Small to Large Ventilation Duties
The 4-79 series covers a broader documented size range than the old webpage showed. The original catalogue extends from No.3A small-size units through No.20E large-volume fans.
This broad A / C / E catalogue structure makes 4-79 suitable for indoor air exchange, supply and exhaust duties across different airflow levels and installation scales, provided the conveyed medium remains within the standard catalogue boundary.
For workshop and building ventilation planning, review the Industrial Workshop Ventilation System. Final model selection should then be confirmed from the actual airflow, pressure and project layout.
4-79 Series Technical Parameters
A, C and E Groups by Fan Size
The original catalogue groups the 4-79 series by model designation and installation arrangement. Use these groups when checking the corresponding performance table, dimensions and transmission components.
No.3 / 3.5 / 4 / 4.5 / 5 / 6
Small-size catalogue group. The dimensional pages show the compact motor-mounted arrangement used on the A models.
No.7 / 8
Medium-size catalogue group with separate shaft, pulley / belt and motor arrangement.
No.10 / 12 / 14 / 16 / 18 / 20
Large-size catalogue group. Performance tables include V-belt, fan pulley, motor pulley and motor guide-rail data.
Where 4-79 Fits - and Where Special Review Is Required
General Industrial Ventilation
Air or other gas that is non-corrosive to steel, without sticky material; dust and hard particles ≤150 mg/m³; gas temperature ≤80°C.
Review Another Material or Fan Family
Corrosive gas, gas above 80°C, sticky material, dust / hard particles above 150 mg/m³, or other process conditions outside the original catalogue boundary.
4-79 Performance Range and Model Coverage
The original 4-79 catalogue tables span the A, C and E model groups. The values below describe the documented envelope rather than one operating point.
Reference condition: air temperature 20°C, density 1.2 kg/m³ and atmospheric pressure 101325 Pa. Final selection must match airflow and pressure from the same model / speed row.
4-79 Outline and Installation Dimensions
The drawing below covers the large No.10 / 12 / 14 / 16 / 18 / 20E group. Use it as an engineering reference together with the selected model. Final project dimensions should be confirmed before foundation, duct or motor-base fabrication.
No.3A-6A
The original catalogue contains separate outline and installation dimensions for the A group.
No.7C-8C
The original catalogue contains separate C-group dimensions and transmission / motor-guide data.
No.10E-20E
The drawing shown on this page represents the large E-group outline and installation arrangement.
For guidance on checking installation interfaces, see the Industrial Fan GA Drawing Guide.
Select 4-79 From the Actual Duty Point
Airflow
Required m³/h, m³/s or CFM.
Pressure
Static or total pressure at the required airflow.
Medium
Confirm gas condition, dust / particles, corrosion and whether sticky material is present.
Temperature
Normal and maximum gas temperature; standard catalogue duty is ≤80°C.
Arrangement & Motor
Confirm the model group, motor voltage / frequency and any site preference for transmission layout.
Installation
Rotation, discharge angle, inlet / outlet interface, foundation and available maintenance space.
If system pressure is not yet confirmed, use the Static Pressure Unknown Guide and send duct length, duct size, elbows, filters and other resistance information.
Indoor Air Supply, Exhaust and Large-Building Air Exchange
Factory Ventilation
General supply or exhaust ventilation for production buildings and large workshops.
Large Building Ventilation
Large-volume air exchange for industrial buildings and utility spaces.
Warehouse Air Circulation
General circulation and exhaust where the conveyed medium remains within standard catalogue limits.
Equipment Room Exhaust
Heat-removal or general exhaust for machinery and utility rooms.
Drying / Process Air Circulation
Large-volume, lower-pressure circulation can be reviewed when actual inlet-gas conditions remain within the confirmed 4-79 limits. View Drying Oven Application →
Replacement Projects
Old fan nameplate, motor data, photos, dimensions, rotation and outlet position can be used to review a replacement.
4-79 Centrifugal Ventilation Fan FAQ
What is the 4-79 centrifugal ventilation fan used for?
It is used for indoor air supply and exhaust, large-building air exchange, factory and workshop ventilation, warehouse circulation, machinery-room exhaust and other ordinary industrial ventilation duties within the documented operating limits.
What is the documented 4-79 model range?
The original catalogue pages supplied for this series cover No.3A through No.20E, including A, C and E groups.
What is the catalogue airflow range?
Across the documented 4-79 tables, the overall airflow range is approximately 990 to 226,500 m³/h. Final selection must match the pressure and airflow from the same operating row.
Can 4-79 be used for dusty or corrosive gas?
Standard catalogue duty allows dust / hard particles up to 150 mg/m³ with no sticky material and no gas corrosive to steel. Conditions outside this boundary require another material or fan-series review.
What is the standard gas-temperature limit?
The original catalogue states that gas temperature should not exceed 80°C for standard duty.
What information should I send before quotation?
Send airflow, pressure, medium, temperature, preferred arrangement if known, rotation, discharge position, voltage, frequency, quantity and any drawing or replacement information available.
Send the Required Airflow and Pressure
Send airflow, total or static pressure, medium, temperature, voltage, frequency, rotation, discharge position, quantity and destination. For replacement projects, attach the old fan nameplate, photos and available dimensions.
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