按照中国GMP:A级送风环境应当至少符合A级区的静态要求。
按照欧盟GMP附录一征求意见稿2020版:Grade A air supply – Air which is passed through a filter qualified as capable of producing Grade A non-viable quality air, but where there is no requirement to perform continuous non-viable monitoring or meet Grade A viable monitoring limits and the area itself is not classified. Specifically used for the protection of fully stoppered vials where the cap has not been crimped and the equipment and engineering systems that have a direct impact on product quality.
A级送风——通过一个经确认过滤器过滤产生的符合A级非活性粒子质量的空气,但没有持续悬浮粒子监测或满足A级微生物监测限度的要求,该区域本身未被定级。特别用于全加塞但未轧盖的西林瓶的保护,该设备和工程系统直接影响产品质量。
总结:中国和欧盟要求不一样。欧盟主要控制悬浮粒子,中国考虑静态A级。另外,A级送风不一定是单向流,但要进行烟雾流型研究。