Generally
a room that is tested for an “operational” condition should be able to be
cleaned up to the “at-rest” clean area classifi cation after a short clean-up
time. The clean-up time should be determined through validation and is
generally of the order of 20 minutes.
这个是WHO关于自净时间的描述,实际上就是从运行状态净化到空闲状态的时间,要求是20分钟以内,说白了,就是从有人操作的标准到室内无人的标准需要多久。GMP采用的实WHO的理解,即动态到静态的标准,实际上根本不需要发烟测试什么的,根据实际进入人员的最多人数进行测试,到人员全都离开现场开始计时恢复到静态标准所需的时间就是你们想要的,发烟测试会影响环境,降低高效寿命,费力不讨好