BS 4558(1970) : 1970被替代
SPECIFICATION FOR POSITIVE PRESSURE POWERED DUST RESPIRATORS
出版：British Standards Institution
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基本信息
标准编号： BS 4558(1970) : 1970
发布时间：1970/1/1 0:00:00
标准类别：Standard
出版单位：British Standards Institution
标准页数：14
标准简介
Establishes requirements for a respirator comprising a mask supplied with filtered air from a power pack which provides protection in adverse environmental conditions while reducing the respiratory load. This standard is written in terms of metric units and gives inch equivalents, which are equally valid. Covers construction, design, facepiece, power pack, filters, harness, connecting fittings and performance requirements.
