BS 4558(1970) : 1970被替代
SPECIFICATION FOR POSITIVE PRESSURE POWERED DUST RESPIRATORS
出版：British Standards Institution
專家解讀視頻
基本信息
標準編號： BS 4558(1970) : 1970
發布時間：1970/1/1 0:00:00
標準類別：Standard
出版單位：British Standards Institution
標準頁數：14
標準簡介
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.
