International Context:

• Research on cleanroom noise standards began in the 1960s.
• The ​​1966 USA Federal Standard 209a​​ and the ​​1974 revised 209b​​ stipulated: “The noise in a cleanroom should be controlled to allow necessary conversation, meet operational or product requirements, and keep personnel within a comfortable and safe range.”
• The ​​ISO/DIS 14644-4 (draft)​​ states: “The appropriate sound pressure level should be selected based on human comfort and safety requirements in the cleanroom, as well as the background noise level of surrounding equipment. The sound pressure level in a cleanroom should range between ​​40–65 dB(A)​​.”

Key Characteristics of Global Standards:

• Cleanroom noise standards are generally ​​stricter than general health protection standards​​.
• The main goal is to ​​ensure normal operation​​, ​​allow essential verbal communication​​, and ​​provide a comfortable working environment​​.
• Most standards set allowable values between ​​65–70 dB(A)​​, with even lower limits in the medical industry.
• The majority of standards use ​​A-weighted sound level (dB(A))​​ as the evaluation metric, though some also specify limits for individual frequency bands.
• A few standards provide different allowable noise values according to ​

  

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  Cleanroom Noise Requirements

  2025-10-11

  A cleanroom not only has strict requirements for indoor air cleanliness, but also specific national standard parameters regarding operational environmental noise. Since a cleanroom is a relatively enclosed and pressurized environment, improper noise control can easily lead to a deterioration in the working conditions for staff and the production environment.

  ① Noise Measurement Method:

  • When the room area is no larger than 50 m², measure only one point at the center of the room.
  • For larger rooms, add one measuring point for every additional 50 m².
  • The measurement point should be 1.0 m above the floor.
  • When possible, it is advisable to measure both the static noise condition of the room and the background noise.

  ② Acceptable Standards:

  The noise level should meet the design requirements. According to the ​​Cleanroom Design Code (GB Standard)​​, in a ​​static state​​, the noise level in ​​non-unidirectional flow cleanrooms​​ should not exceed ​​60 dB(A)​​. For ​​unidirectional and mixed flow cleanrooms​​, the noise level should not exceed ​​65 dB(A)​​.

  Cleanroom Noise Control

  The formulation of cleanroom noise standards mainly takes into account the ​​annoyance effect of noise​​, ​​interference with verbal communication​​, and ​​impact on work efficiency​​. Domestic research on the health effects of noise indicates that general industrial noise below ​​80 dB(A)​​ has minimal impact on health.

  International Context:

  • Research on cleanroom noise standards began in the 1960s.
  • The ​​1966 USA Federal Standard 209a​​ and the ​​1974 revised 209b​​ stipulated: “The noise in a cleanroom should be controlled to allow necessary conversation, meet operational or product requirements, and keep personnel within a comfortable and safe range.”
  • The ​​ISO/DIS 14644-4 (draft)​​ states: “The appropriate sound pressure level should be selected based on human comfort and safety requirements in the cleanroom, as well as the background noise level of surrounding equipment. The sound pressure level in a cleanroom should range between ​​40–65 dB(A)​​.”

  Key Characteristics of Global Standards:

  • Cleanroom noise standards are generally ​​stricter than general health protection standards​​.
  • The main goal is to ​​ensure normal operation​​, ​​allow essential verbal communication​​, and ​​provide a comfortable working environment​​.
  • Most standards set allowable values between ​​65–70 dB(A)​​, with even lower limits in the medical industry.
  • The majority of standards use ​​A-weighted sound level (dB(A))​​ as the evaluation metric, though some also specify limits for individual frequency bands.
  • A few standards provide different allowable noise values according to ​

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