(4279+ of 3M) with 2 large-area active carbon inhalation valves and exhalation valve size adjustable by 4-points ribbon system, multiple use, no maintenance up to 30-fold MAK value for particles, certain organic gases and vapours, (boiling point >65°C) acid gases and vapours, ammonia and organic ammonia derivatives protection against uncomfortable odours CE, EN 405:2001+ A1:2009
