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- Description
Specifications
The facepiece should preferably be provided with one or more inhalation valve(s).
If a thread connection to prEN 148-1 is used, an inhalation valve shall be incorporated in the facepiece.
Where the facepiece is intended to be used with filters it shall be provided with an integral inhalation valve, if
there is no valve in the filter.
Inhalation valves shall function correctly in all orientations and shall meet the requirements of 6.15.
Exhalation valves shall function correctly in all orientations and shall meet the requirements of 6.15.
The facepiece shall have at least one exhalation valve or appropriate means to allow the escape of exhaled air
and, where applicable, any excess air delivered from a supplied air source.
Exhalation valve Pass
Exhalation valves (if fitted) shall be protected against or be resistant to dirt and mechanical damage. They may
be shrouded or include any other device that may be necessary to comply with 6.16.
Exhalation valves shall continue to operate correctly after a continuous exhalation flow of 300 l/min over a
period of 30 s and meet the requirements of 6.15.
When the exhalation valve housing is attached to the faceblank, it shall withstand axially a tensile force of 50 N
applied for 10 s.
Note 8. The results are shown in Annex A Table 6.12.
Compatibility with skin Pass 9
Materials that may come into contact with the wearer’s skin shall not be known to be likely to cause irritation or
any other adverse effect to health.
Note 9. No irritation or any other adverse effect to health.
Carbon dioxide content of the inhalation air Pass 10
The carbon dioxide content of the inhalation air (dead space) shall not exceed an average of 1,0 % (by volume)
Note 10. Test results are shown in Annex A Table 6.14.
Breathing resistance Pass 11
The breathing resistance of the facepiece shall not exceed 2.0mbar for inhalation when tested with a continuous
flow of 160l/min.