FIELD: means of protection.
SUBSTANCE: breath protection device includes facial sealant and composite body part, which forms joint with facial sealant and consists of sight glass and frame. Frame is not a composite part of sight glass and includes at least one port for pipeline connection. Method is suggested for device operation, as well as combination, comprising facial sealant and the first and second bearing shells, every of which is adapted for joint with facial sealant and includes sight glass and frame, besides frame is not a composite part of sight glass and includes at least one port for pipeline connection.
EFFECT: reduced cost of manufacturing and simplified design.
20 cl, 5 dwg
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