Zhejiang Jindun Ventilator Co., Ltd. was established on December 28, 2005, and its headquarters is located in Shaoxing City, Zhejiang Province. It is a national high-tech enterprise engaged in the research and development, production and sales of ventilation system equipment in fields such as subways, tunnels, nuclear power, and the military industry. The business scope of the company includes general business items: fans, air cooling, water cooling, air conditioning equipment, etc.

GZ DP Anechoic T&E Co., Ltd. consists of a team of acoustic experts and professional engineers who have been engaged in various acoustic technology researches at home and abroad for many years and possess rich theoretical and practical experience. It owns its own office buildings and factories. There is an acoustic laboratory built in the factory that meets the CNAS standards, and this laboratory can monitor the acoustic technical indicators of the products of this company and provide external acoustic testing services. Through the arduous efforts, continuous innovation and development of the Danpin team, the acoustic laboratories designed, produced and installed by the team have products with accurate technical indicators, being environmentally friendly, durable in quality, beautiful in appearance and high in technological content.

The semi-anechoic chamber is not only a special laboratory for acoustic testing, but also an important part of the testing system. In fact, it is also one of the acoustic testing equipment, and its acoustic performance indicators directly affect the testing accuracy. For specific acoustic design, manufacturing, construction, installation and brief introduction of on-site actual measurement and acceptance and other follow-up materials, please pay attention to browsing the project cases on the official website of the company, or scan the QR code of the WeChat public service account of the company to get free push notifications. For detailed materials, please go to the download center on the official website of the company to download them for free.

Keywords: soundproof chamber, anechoic chamber, quiet chamber, reverberation chamber, semi-soundproof chamber, semi-anechoic chamber, fully soundproof chamber, fully anechoic chamber, acoustic measuring instruments, vibration measuring instruments.

I.?Procurement Content

1. Semi-anechoic chamber;

2. It can meet the acoustic performance testing of fans of any size with a diameter D ≤ 1m.

II. Basis of Standards

1. GB/T 6882 "Acoustics - Determination of sound power levels of noise sources - Precision methods for anechoic rooms and fully anechoic rooms";

2. ISO 3745 "Acoustics - Determination of sound power levels of noise sources - Precision methods for anechoic rooms and fully anechoic rooms".

III.?Main Indicators and Project Content

1. The background noise Lgn(A) in the semi-anechoic chamber is less than or equal to 25 dB(A);

2. Cut-off frequency: Fc ≤ 100 Hz.?

IV. Measurement and Acceptance?

The background noise measured under normal working conditions.

V. Photos upon Completion

(Photos of the completed semi-anechoic chamber)

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