1. BS 8468-3.2. Respiratory protective devices for use against chemical, biological, radiological and nuclear (CBRN) agents. Part 3.2. Air-purifying devices incorporating a hood for escape. Specification (3rd December 2019) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (14 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗