BS N 4:1974
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Hardcopy , PDF
23-11-2007
English
01-01-1974
Foreword
Specification
1. Scope
2. Design and construction of mask
2.1 General requirements
2.2 Sizing
2.3 Materials
2.4 Design
3. Performance
3.1 Mechanical
3.2 Pneumatic
3.3 Acoustics
3.4 Wearer requirements
3.5 Environmental
Appendices
A. Vibration transmittibility: mechanical vibration
transmitted to the mask assemblies when worn by a
seated subject
B. Conversion of units of measurement
Figure
1. Vibration transmission to a mask assembly when worn
by a seated subject
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