The ISQ series is a high-performance no-scroll backward curved centrifugal fan engineered for efficient and reliable air movement in ducted ventilation systems. Its innovative square compact design eliminates the traditional volute casing, making it ideal for space-constrained installations in both commercial and industrial environments.

This fan series offers a wide performance range with air flow from 1146 m³/h to 37750 m³/h and total pressure from 110 Pa to 513 Pa. It is available with aluminum alloy or iron impellers to meet different application requirements for corrosion resistance, durability and cost-effectiveness. All models feature optimized aerodynamic design for maximum energy efficiency and low noise operation.

• High-Efficiency Backward Curved Impeller - Advanced aerodynamic blade profile delivers superior air performance with minimal energy consumption. Available in both lightweight aluminum alloy and heavy-duty iron materials. Precision-balanced impellers ensure smooth, vibration-free operation.
• Space-Saving No-Scroll Square Design - Compact square structure fits perfectly into standard ductwork systems. Eliminates bulky volute casing, reducing installation footprint by up to 40% compared to traditional centrifugal fans. Easy to integrate into existing HVAC and ventilation systems.
• Ultra-Low Noise Operation - Optimized blade geometry significantly reduces aerodynamic noise. Noise levels as low as 52 dB(A) for small models. Ideal for noise-sensitive environments such as offices, hospitals and commercial buildings.
• Robust & Durable Construction - Heavy-duty steel casing with corrosion-resistant coating. High-quality motors designed for continuous 24/7 operation. Reinforced structure ensures long service life even in demanding industrial conditions.
• Wide Performance Range - 8 standard models covering airflow requirements from small offices to large industrial facilities. Multiple speed options (1450 r/min, 960 r/min, 720 r/min, 560 r/min) for precise performance matching. Suitable for both supply and exhaust air applications.

Note: All parameters are based on standard conditions (air temperature 20 °C, atmospheric pressure 101300 Pa, air density 1.2 kg/m³). Aluminum impellers are standard; iron impellers are available upon request.

• General ventilation and air exchange in commercial buildings, offices, hotels and hospitals
• Duct air supply and exhaust systems in industrial workshops and warehouses
• HVAC system integration for air conditioning and heating distribution
• Air circulation in clean rooms, laboratories and pharmaceutical facilities
• Equipment cooling for machinery and electrical cabinets
• Kitchen ventilation and light-duty fume extraction
• Ventilation for parking garages and basements

• 1* complete ISQ no-scroll square centrifugal fan unit
• 1* matching high-quality three-phase asynchronous motor
• 1* set of standard installation accessories
• Detailed installation, operation and maintenance manual

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

• Exact fan model number (e.g., ISQ-B-400)
• Required impeller material (aluminum alloy or iron)
• Required voltage and frequency
• Any special requirements for rotation direction or outlet position
• Customization needs for 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.