The 4-68 series centrifugal fan is a high-efficiency industrial ventilation equipment designed for general factories and large buildings. It can be used for both air supply and exhaust applications. This fan is engineered to convey air and other non-flammable, non-toxic, non-corrosive gases to steel materials with a maximum temperature of 80℃. The conveyed gas must not contain viscous substances, and the content of dust and hard particles shall not exceed 150 mg/m³.

• High-Efficiency Impeller Design: Equipped with 12 backward-curved airfoil-shaped blades welded between an arc-conical wheel cover and a flat wheel disc. All impellers are made of high-quality steel plates and undergo strict static and dynamic balancing correction as well as overspeed operation tests. Excellent aerodynamic performance, high operating efficiency and stable operation.
• Modular Casing Structure: Volute-shaped casing welded from ordinary steel plates with good structural strength. Integrated non-detachable casing for models No.2.8~5 for compact installation. Three-part split casing for models No.16B and No.20B (divided horizontally and vertically), allowing vertical lifting of the rotor for easy maintenance.
• Optimized Air Inlet: Convergent streamlined integrated structure to minimize air resistance and improve airflow efficiency. Firmly fixed to the fan inlet side with bolts for reliable connection.
• Multiple Transmission Options:
  • Type A (Direct Drive): For models No.2.8~5, impeller and casing are directly fixed on the motor shaft and flange
  • Type C (Belt Drive): For models No.6.3~12.5, pulleys are located outside the bearings for easy speed adjustment
  • Type D (Coupling Drive): For models No.6.3~12.5, rigid coupling connection for high transmission efficiency
  • Type B (Belt Drive): For models No.16~20, pulleys are located between the bearings for stable operation of large fans
• Reliable Transmission Assembly: Main shaft made of high-quality steel for long service life. Integrated bearing housing with thermometer and oil level indicator for models No.6.3~12.5. Two parallel bearing seats with thermometers for models No.16B and No.20B, using bearing grease lubrication.
• Performance Guarantee: Factory-tested performance ensures that the full pressure value does not exceed ±5% of the rated value under the given flow rate. Performance points are divided into 7 equal parts within the 90% maximum efficiency range for precise selection.

Note: The above parameters are based on standard conditions (air temperature 20℃, atmospheric pressure 101325Pa, air density 1.2kg/m³). Performance conversion is required for non-standard working conditions.

• Rotation Direction: Right-hand (clockwise when viewed from the motor end) / Left-hand (counterclockwise when viewed from the motor end)
• Air Outlet Angle: 0°, 45°, 90°, 135°, 180°, 225° (available for both rotation directions)

• Indoor ventilation and air exchange in general industrial factories
• Ventilation systems for large commercial buildings, warehouses and workshops
• Air supply and exhaust systems for production lines and process equipment
• General ventilation and air circulation in public facilities

• Type A Drive: 1* fan unit, 1* matching motor, 1 set of anchor bolts (4 pieces)
• Type B/C Drive: 1* fan unit, 1* matching motor, 1 set of motor slide rails (2 pieces), 1 set of anchor bolts (4 pieces for No.6.3, 8 pieces for No.8 and above), 1* motor pulley, 1 set of V-belts
• Type D Drive: 1* fan unit, 1* matching motor, 1 set of anchor bolts (4 pieces for No.6.3, 8 pieces for No.8 and above), 1 set of coupling
• Customized supply scope available according to customer agreements

When placing an order, please specify the following information clearly:

1. Fan model number (No.)
2. Rated speed (r/min)
3. Required air flow (m³/h) and full pressure (Pa)
4. Air outlet angle and rotation direction
5. Motor model, rated power (kW) and rated speed (r/min)
6. Any special requirements for materials, coatings or accessories

Established in 1999, Hunan Xinhongyuan Hi-Tech Co., Ltd. illuminates the industrial landscape with its pioneering spirit and profound expertise in industrial blowers and centrifugal fan equipment. As a distinguished national high-tech enterprise, we masterfully navigate the entire spectrum of research and development, production, sales, and service. Our extensive product range spans axial fans, centrifugal fans, and silent fans, all supported by a seamless and integrated customer service system that fuses R&D, production, and sales into a harmonious whole.

Driven by an unwavering commitment to technological advancement, we embody the 'brand enterprise' philosophy. Our collaborative ventures with illustrious institutions, including Central South University, Zhejiang University, Huazhong University of Science and Technology, and Changsha University of Science and Technology, foster ongoing technical exchange and cooperation. Together, we are empowered to continually push the frontiers of fluid dynamics and engineering excellence.

Our steadfast dedication to groundbreaking independent research and development has led to the formation of a top-tier R&D team. By employing state-of-the-art technologies such as 3D modeling, CFD flow field simulation, FEA finite element analysis, and CAD computer-aided design, we consistently redefine the parameters of fan technology. By seamlessly integrating these cutting-edge methodologies with our vast practical expertise, we persistently innovate and elevate our product offerings, establishing new standards for performance and efficiency in the industry.

1. What are your company's competitive advantages in the industry?
We have advanced technology, high-quality products, a complete after-sales service system, and rich industry experience. In terms of technology, we continue to innovate and continuously introduce products with better performance; in terms of product quality, we strictly control every link to ensure the reliability and stability of the products; in terms of after-sales service, we respond promptly and comprehensively protect the rights and interests of customers; our rich project experience enables us to quickly and accurately meet the diverse needs of different customers, and has established a good reputation in the industry.

2. What is your main business?
We offer fan-related products, as well as customized solutions on demand, and are always available for consulting services.

3. What are your strengths?
Our team members are professionals in the wind turbine application industry, the company was established for 30 years, focusing on product research and development, and has rich experience in manufacturing process and production management.

4. How do I place an order?
Please contact the service department