Aerodynamic muffler applications and product features: 
Fans are a type of general machinery and equipment with a wide range of applications, essential in various industries such as electricity, mining, machinery, metallurgy, and chemicals. The noise produced during the operation of fans often becomes a source of harm to workers' health and environmental interference. Particularly, fans located near residential areas, with their intake and exhaust air streams emitting aerodynamic noise, are a major factor in environmental pollution, causing public hazards. They have become one of the main targets for noise pollution control efforts by China's industrial sector in recent years.
Industrial fans are continuous operation equipment. The International Organization for Standardization (ISO) stipulates a noise standard of ≤85 decibels for such equipment. Our country's new standard is identical, which serves as the basis for continuous noise compliance in industrial enterprises. However, without the use of noise reduction measures, the noise emitted from the intake and exhaust outlets of the fan can reach 110-120 decibels, far exceeding the compliance requirements.
The series of silencers is of impedance type. Based on the characteristic data obtained from actual field tests of noise sources from various fans, our factory determines the required amount of noise reduction at different frequency ranges for designing the acoustic absorption panel structure and fluid channels. Additionally, we employ narrow rectangular channels with a large surface area of acoustic material to enhance absorption. We understand that the noise sources of fans often have multiple frequency values at higher noise levels, and the noise reduction requirements vary for different frequency bands. Therefore, this product utilizes a resistive structure for high and medium-frequency noise reduction and an antiresonant structure for medium and low-frequency noise reduction. Furthermore, we incorporate both high-frequency and low-frequency noise reduction zones within the resistive channels to maximize the broadening of the noise reduction frequency band, achieving an excellent noise reduction effect.
Upon installation in accordance with requirements, the product's maximum noise level will not exceed 85 to 90 decibels.
This muffler, as described in this specification, is suitable for a variety of blowers, exhaust fans, centrifugal fans, axial fans, Roots blowers, dedusting fans, ventilators, and air compressors. In addition, our factory designs and produces mufflers for various applications, including gas turbine and diesel engine exhausts. We welcome inquiries and purchases from customers.