EN 136 - standard full face masks
EN136 Full Face Masks
This standard specifies the requirements for full face masks for use as part of a respiratory protective device. These facepieces may be used in negative pressure systems, powered or supplied air systems .
There are three classes of Full Face Masks:
Class 1 - Light duty and Low maintenance
Class 2 - General duty, with maintainable parts
Class 3 - Heavy duty Fire fighters