其中最有挑战的是美国国家防火协会的285测试方法。
The most challenging of these are the criteria associated with the National Fire Protection Assn. 's (Quincy, Mass. ) NFPA 285 test method.
美国国家防火协会对指示器在某些行业的应用有特殊要求，例如医院等。
The NFPA has specific requirements for remote annunciators used in some applications, such as hospitals.
如果安装在防火喷淋系统上，所有机械式止回阀，如警告止回阀和防回流阀，都应该根据美国国家消防协会NFPA13和NFPA25标准进行流量测试和内部检查。
If installed on a fire sprinkler system, all mechanical checks, such as alarm checks and backflow preventers, should be flow tested and inspected internally in accordance with NFPA 13 and NFPA 25.
美国国家 防火协会（NFPA）指导原则要求对于主管线上运行的阀门，如关闭阀或防回流阀总成，必须进行流量测试。
The National Fire Protection Agency (NFPA) Guidelines require a confirming flow test to be conducted whenever a "main line" valve such as the shutoff valves or a backflow assembly have been operated.
美国国家 防火协会（NFPA）指导原则要求对于主管线上运行的阀门，如关闭阀或防回流阀总成，必须进行流量测试。
The National Fire Protection Agency (NFPA) Guidelines require a confirming flow test to be conducted whenever a "main line" valve such as the shutoff valves or a backflow assembly have been operated.
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