与100%外部空气系统相比，在制药设施中使用再循环空气可以大大降低运营成本，并提供更可控的环境。本文报告了与设施鉴定有关的设计考虑、施工细节和测试方法。审查整个系统配置，重点是过滤设备、管道系统完整性、控制系统设计以及对各种制药设施和工艺的适用性。系统已经安装并运行了几年。本文探讨了循环系统带来的好处，以及有关公用设施使用和系统运行成本的细节。 单位:双引文:研讨会，ASHRAE交易，1987年，第93卷，第。1，纽约州纽约市

The use of recirculated air in pharmaceutical facilities can substantially reduce operating cost and provide a more controlled environment than that provided by 100% outside air systems. This paper reports on design considerations, construction details and testing methods involved with facility qualification. Overall system configuration is reviewed with focus on filtration equipment, ductwork integrity, control system design and applicability to various pharmaceutical facilities and processes. Systems have been installed and are operating for several years. The benefits derived from a recirculated system are explored along with specifics regarding utility usage and system operating cost.Units: Dual