4-79 Centrifugal Ventilation Fan
The 4-79 centrifugal fan supports ordinary indoor air supply, industrial building exhaust, workshop ventilation and large-space air circulation. Confirm airflow, pressure, gas condition and installation before determining model, drive and motor.
General Industrial Supply, Exhaust and Air Exchange
The 4-79 series is suitable for factory buildings, workshops, warehouses, machinery rooms and other large indoor spaces where the supplied or extracted gas is ordinary non-corrosive air. Supply and exhaust layouts have different duct and outlet requirements; the full system resistance must be included in the selection.
General air supply and extraction where airflow, pressure and duct losses match the selected operating point.
Large-space air exchange and circulating airflow under ordinary working-medium conditions.
General exhaust and heat removal for indoor mechanical and utility rooms.
Confirm the old fan duty point, motor, impeller, outlet angle, base dimensions and operating arrangement.
Operating Boundaries for Standard 4-79 Duty
| Condition | Existing-Page Reference | Engineering Check |
|---|---|---|
| Gas medium | Non-flammable, harmless and non-corrosive ordinary gas | Confirm exact gas composition |
| Sticky substances | Not allowed in the conveyed gas | Check process deposits, condensation and coating risk |
| Dust and hard particles | Not over 150 mg/m³ | Special review if dust or wear conditions exceed standard duty |
| Gas temperature | Not over 80°C | Review continuous and peak temperature |
4-79 Series Technical Specifications and Size Groups
The current original 4-79 catalogue page documents No.3A–No.20E, airflow 990–226,500 m³/h, total pressure 177–3,334 Pa, fan speed 260–2900 r/min and motor power 0.75–132 kW. These overall catalogue ranges are not one simultaneous operating point.
Compact motor-mounted catalogue group; check its original model performance and installation drawings.
Intermediate separate-shaft group with pulley, belt and motor drive; confirm the transmission specification.
Large group with original performance tables, V-belts, pulleys, motor guide rails and installation dimensions.
Original catalogue reference: 20°C air, density 1.2 kg/m³ and atmospheric pressure 101325 Pa.
| Parameter | Original 4-79 Catalogue |
|---|---|
| Models | No.3A–No.20E |
| Airflow | 990–226,500 m³/h |
| Total pressure | 177–3,334 Pa |
| Fan speed | 260–2900 r/min |
| Motor power | 0.75–132 kW |
| Standard temperature | ≤80°C |
| Dust / hard particles | ≤150 mg/m³ |
| Reference density | 1.2 kg/m³ |
| Reference conditions | 20°C, 101325 Pa |
Required Project Information
Airflow in m³/h and pressure in Pa at the same operating condition; duct resistance if pressure is unknown.
Confirm temperature, dust, hard-particle loading, composition and any possible sticky material.
Voltage, frequency, available space, preferred arrangement and control method.
Rotation, outlet angle, duct interface, base, foundation and access for maintenance.
Where the 4-79 Series Is Used
The original QIYUE 4-79 page documents ordinary industrial supply, exhaust and air-exchange duties. These examples remain subject to the specified gas, temperature, dust and system-resistance limits.
Air supply and exhaust for production buildings and industrial workshops with a confirmed pressure-loss calculation.
General ventilation of large industrial buildings where the selected fan can deliver the design airflow against actual resistance.
Circulation and exhaust in warehouses handling ordinary non-corrosive air without viscous material.
General air exchange and heat removal for machinery and utility areas within catalogue temperature limits.
Review for suitable process-air duties only after confirming the actual inlet-gas temperature and medium.
Compare the old unit’s nameplate, motor, rotation, discharge position, dimensions and measured duty point.
For system-level guidance see the industrial applications overview and the fan selection process. A category name does not replace performance-curve selection.
Buyer Questions About the 4-79 Series
Can this fan handle dusty or corrosive gas?
Standard operation is for non-corrosive gas without sticky substances. Source-page limits identify dust and hard particles not exceeding 150 mg/m³. Other conditions need separate engineering review.
What is the maximum airflow of the 4-79 series?
The current original catalogue page lists 990–226,500 m³/h for the No.3A–No.20E family. The actual selected model must meet airflow and pressure at the same operating point.
What should I supply for a quotation?
Send required airflow, pressure, medium condition, temperature, electricity details, outlet position, quantity and any original equipment dimensions or nameplate photos.
Which installation and drive arrangements are documented for 4-79?
The expanded old-site catalogue groups the series into A, C and E arrangements. Match the selected size and the corresponding original performance and dimensional tables before confirming a configuration.
What reference conditions are stated in the expanded catalogue?
The existing expanded 4-79 page lists 20°C air temperature, 1.2 kg/m³ reference density and 101325 Pa atmospheric pressure. These reference conditions are not the customer’s operating conditions; select using the actual project data.
Is 4-79 a direct replacement for 4-72?
No. Both are general industrial ventilation families, but the model size, performance curve, drive group and installation envelope must be checked separately.
What should be provided for a replacement-fan project?
Provide the old fan nameplate, photographs, existing motor data, airflow, pressure, rotation, outlet position, connection and foundation dimensions.
Review Your 4-79 Duty Point
Send the working conditions and drawings for an accurate project-specific fan proposal.