The SF ultra-low noise axial fan is a general-purpose industrial/civil ventilation equipment designed for low-noise and high-volume air flow scenarios. Its core advantage lies in ensuring efficient ventilation while keeping the operating noise at an extremely low level.

I. Core Principles and Structure
Core noise reduction design: It adopts wide blades with large chord length, spatial distortion, and inclination, and is designed with low speed and high pressure coefficient to reduce noise from the source. Some high-end models use bionic serrated blades for further noise reduction.
Main components: Impeller (aluminum alloy die-casting), casing (steel plate welding), motor (all-copper core), safety mesh cover, and bracket.
Operation mode: Axial flow – air flows parallel to the fan shaft, featuring large air volume and moderate air pressure.

II. Core Performance Characteristics
Ultra-low noise: The noise is usually controlled at 68-72 dB(A), much lower than that of ordinary fans (85 dB+), approaching the ambient noise level of an office.
High efficiency and energy saving: Low air resistance, high efficiency, and equipped with energy-saving motors, it saves more electricity than traditional fans.
Large air volume: The air volume range is wide, with common models ranging from approximately 300 to 50,000 m³/h, and air pressure from 30 to 500 Pa.
Stable and reliable: The impeller is dynamically balanced, with low vibration, smooth operation, and long service life.
Diverse structures:
Installation types: Pipeline type, wall-mounted type, post type, fixed type, and mobile type.
Special customization: Explosion-proof type, anti-corrosion type, and frequency conversion type.

III. Technical Parameters (Reference)
Fan size: 2.2# – 10# (diameter approximately 250 – 1000 mm)
Voltage: 220V/380V
Noise: 68 – 72 dB(A)
Operating environment: Temperature -20°C to +40°C, altitude < 1000m

IV. Typical Application Scenarios
High noise reduction requirements: Hospitals, schools, libraries, offices, hotels, laboratories.
Industrial plants: Electronics, food, medicine, light industry, and warehousing (requiring low-noise ventilation/cooling/exhaust).
Civil buildings: Shopping malls, underground garages, and venues for ventilation and air exchange.

V. Comparison with Ordinary Axial Fans
Noise: SF ultra-low noise (68-72 dB) vs. ordinary (85 dB+)
Blades: Wide, twisted, low-speed high-volume vs. narrow, high-speed
Application: Low-noise, comfortable environment vs. general industrial, no noise reduction requirements