7.1.3　1　At least three stages of air filtration shall be provided

7.1.4　The use of ordinary fan coil units or air conditioners is strictly prohibited in clean rooms

7.1.9　4　The outlet of the exhaust air duct shall not be located inside the technical mezzanine, and shall lead directly to the outdoors

7.3.7　Electrostatic air cleaning devices shall not be used as the final-stage purification facility of the clean air-conditioning system