前言:这是CSA标准CAN/CSA-M42 7《通风材料的防火性能和防火要求》的第一版。之所以开发这项技术，是因为为了评估通风管道，从而防止火灾蔓延，有必要对通风管道进行耐火试验。由于逃生途径有限，地下矿井发生火灾可能非常危险。通风管和布通常由聚合物材料制成，一旦点燃，就有可能蔓延到火中。本标准概述了通过确定地下矿井通风管材料的易燃性和抗静电要求，确保通风管材料安全使用所需的试验方法。范围:1.1本标准规定了火灾- 地下矿山用新型（未使用）通风材料的性能和抗静电要求。1.2通风材料可分为两类:刚性管和柔性板。（后者既可以以挂片的形式使用，也可以制成管子。）这两个类别之间的物理差异要求测试和要求略有不同。然而，本标准的目的是确保以同等方式评估防火性能和抗静电特性。1.3本标准涵盖以下类型的通风材料:（a）VH-AS型，用于爆炸性环境中的垂直或水平应用；（b） VH型，用于非爆炸性大气中的垂直或水平应用； （c） H型，用于接近水平的爆炸性环境；（d） H型，用于非爆炸性大气中的水平或近水平应用。注:（1）字母V、H和AS分别代表垂直、水平和抗静电。（2） 垂直应用最为严重，因为“烟囱效应”可能加速火灾蔓延。1.4除非第5条另有说明，否则本标准不涉及燃烧产物或受火或加热的通风材料的热降解产物。注:虽然本标准的目的是为通风材料建立合理的防火性能水平，但任何通风材料都可能在不同于本标准所述的条件下燃烧。

Preface:This is the first edition of CSA Standard CAN/CSA-M42 7,Fire-Performance and Anristutic Requirements for Ventilation Materials. It was developed because a fire-resistance test for ventilation ducts has become necessary in order to permit evaluation of ducts and thus prevent fire spread. A fire in an underground mine can be very dangerous because of limited means of escape.Ventilation tubing and brattice cloth are often made of polymeric materials that have the potential to spread to a fire once ignited.This standard outlines the test methods necessary to ensure the safe use of ventilation tubing materials by determining their flammability and antistatic requirements for underground mines.Scope:1.1This Standard specifies the fire-performance and antistatic requirements for new (unused) ventilation materials for use in underground mines.1.2Ventilation materials can be divided into two categories: rigid tubing and flexible sheeting. (The latter can be either used in the form of hanging sheets or made into tubing.) The physical differences between these two categories require that the tests and requirements be slightly different. The intent of this standard, however, is to ensure that the fire-performance and antistatic characteristics are evaluated in an equivalent manner.1.3This Standard covers ventilation material of the following types:(a) Type VH-AS, intended for either vertical or horizontal applications in explosive atmospheres;(b) Type VH, intended for either vertical or horizontal applications in nonexplosive atmospheres;(c) Type H-AS, intended for horizontal or near-horizontal applications in explosive atmospheres;(d) Type H, intended for horizontal or near-horizontal applications in nonexplosive atmospheres.Notes:(1)The letters V, H, and AS stand for Vertical, Horizontal, and Antistatic respectively.(2)Vertical applications are the most severe because of the possibility of a "chimney effect" accelerating the spread of the fire.1.4This Standard does not address the products of combustion or of thermal degradation from ventilation materials subjected to fire or heating, except as noted in Clause 5.Note:While the object of this Standard is to establish a reasonable level of fire-performance for ventilation materials, it is recognized that any ventilation material may burn under conditions different from those described in this Standard.