1.范围1。1.范围1。1.1本标准涵盖了拟安装在垂直通风管道系统上的通风管塑料膜漏斗，并规定了材料、物理特性、性能测试和标记的要求。1.1.2通风管塑料薄膜漏斗安装在通风管上，以将可能从通风管外部滴到通风管内部并进入排水废水系统的水分（如雨水）重新分配，同时不影响通风管的完整性。

1 Scope1.1 Scope1.1.1This Standard covers vent pipe plastic membrane funnels intended for installation on vertical vent piping systems and specifies requirements for materials, physical characteristics, performance testing, and markings.1.1.2Vent pipe plastic membrane funnels are installed on vent pipe to re-route any moisture (such as rain) that may trickle down the outside the vent pipe to the inside of the vent pipe and into the drain waste system while not compromising the integrity of the vent pipe.