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 10Pa 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.
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 hign cleanliness and should not be higher than 1000.
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 I room is necessary. One negative pressure clean operation room is optional if the condition permits. For specialist hospital, the number of especially clean operation room should be determined based on the actual needs.
