"1.The positive pressure of not less than 10Pa shall be maintained in clean area compared with unclean area. The positive pressure of not less than 15Pa shall be maintained in clean area compared with the outside or the area connecting to the outside. The extrusion difference should not be greater than 30Pa.
潔凈區對與其相通的非潔凈區應保持不小于10Pa的正壓，潔凈區對室外或對與室外直接相通的區域應保持不小于15Pa的正壓，所有擠壓差均不應大于30Pa。
2.The buffer room should be set between clean area and unclean area with area not less than 3m2, the cleanliness level should be at the same level as the side with high cleanliness and should not be higher than 1000.
潔凈區與非潔凈區之間應設面積不小于3m2的緩沖室，其潔凈度級別應與潔凈度高的一側同級，并不應高于1000級。
3.The number, size and air cleanliness level of operation room in the clean operation department should be determined according to the nature, scale, level and financial conditions of the hospital. For a comprehensive hospital, if class I clean operation room is required, the number of such clean operation room should not exceed 15% of the total number of clean operation room, but at least l room is necessary. One negative pressure clean operation room is optional if the condition permits. For specialist hospitals, the number of especially clean operation room should be determined based on the actual needs.
潔凈手術部中潔凈手術室的數量、大小及空氣潔凈度級別，宜依據醫院的性質、規模、級別和財力來決定。對于綜合醫院，需建I級潔凈手術室時，該類潔凈手術室間數不應超過潔凈手術室總間數的15％，至少l間；有條件時根據需要可設l間負壓潔凈手術室。對于專科醫院，特別潔凈手術室應根據實際需要確定建設數量。
Cleanliness Room Purity Ranking and Wind Change Times / 潔凈室凈化級別及換風次數
Class 級別 ------- Number of the wind change／hour 換風次數
100 Class 級 ------ More than 100 / hour 100次以上 / 小時
1000 Class 級 ------ 50-60 / hour 50-60次 / 小時
10000 Class 級 ------ 20-25 / hour 20-25次 / 小時
100,000 Class 級 ------ 15-20 / hour 15-20次 / 小時
300,000 Class 級 ------ More than 10 / hour 10次以上 / 小時
1,000,000 Class 級 ------ More than 10 / hour 10次以上 / 小時"