[Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product - decontamination] pressure for most of the provisions of clean room space refrigeration engineering, in order to prevent the intrusion of outside contamination, the need to maintain the internal pressure (hydrostatic) higher than the outside pressure (HIP). Maintain the pressure difference should meet the following general principles: 1. Clean space pressure is higher than the pressure of non-clean space. 2. cleanliness level high pressure is higher than the adjacent room cleanliness level low pressure space. Rely on fresh air to maintain the pressure difference, the fresh air to be able to compensate for the pressure difference in the leakage air flow out from the gap. Therefore, the pressure difference between the physical meaning is the leakage (or permeation) resistance to a variety of air flow through the clean room when the gap. [Tianjin Jinzhong Ji HVAC purification equipment to recommend the star product - decontamination] noise control noise standards are generally stricter than cleanroom standards to protect the health, the purpose is to protect the normal operation, meet the necessary contacts and safe and comfortable conversation work environment. Therefore, the main indicator to measure the noise of the clean room is: 1. Effects due to noise annoyance, people feel uneasy mood generated worry, generally divided into very quiet, very quiet, quieter, somewhat noisy, relatively noisy and very noisy annoyance grade seven. Where the level of response are very noisy and very noisy who works offer, namely the high percentage of troubles, troubles high number is the total number of high annoyance rate. 2. Impact on the efficiency of which mainly depends on the level of response in three areas, these three areas are: concentrate, accuracy action projects, working speed; 3. Integrated communications interference which is mainly divided into: clear or satisfactory ventilation pipeline project, a little difficult, difficult, impossible for more than three indicators are used to evaluate A sound level. In the 1950s, had proposed using a spectral curve as the evaluation criteria that each band center frequency sound pressure level shall not exceed the curve. A brush later learned to measure the noise level of the speech and noise disturbance and annoyance more Taiwan proper extent, can replace octave band sound pressure levels as indicators of evaluation criteria. HVAC engineering, Tianjin Engineering, Tianjin Jinzhong Ji HVAC HVAC company by Tianjin Jinzhong Ji purification equipment. Tianjin Jinzhong Ji HVAC purification equipment Limited (www.Jzjnt.com) strong, credible, in Tianjin fans, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the group into the brilliant and you work for a better future!