BREATHING AIR REQUIREMENTS
AIR QUALITY
The Free-Air
®
pump’s inlet filter must be
located in a clean breathable air location at all
times.
The breathable air drawn into the inlet filter
must meet at least the requirements for Type
1 gaseous air described in the Compressed
Gas Association Commodity Specifications
G-7.1 (Grade D or higher), as specified by
Federal Law 30CFR, Part 11, Subpart J,
11.121(b).
The requirements of Grade D breathable air
include:
* Oxygen ...................................19.5 - 23.0 %
* Hydrocarbons (condensed)
in mg/m
3
of gas...............5 mg/m
3
maximum
* Carbon Monoxide............10 ppm maximum
* Carbon Dioxide ..........1,000 ppm maximum
* No toxic contaminants at levels which
would make the air unsafe to breathe.
Refer to the C.G.A. Commodity Specification
G-7.1 for complete details. It is available from:
Compressed Gas Association, 500 Fifth Ave.,
New York, NY 10036.
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