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  2. These requirements will govern the amount of contamination to which welders may be exposed:

    1. Dimensions of the area in which the welding process takes place (with special regard to the height of the ceiling).
    2. The number of welders in the room.
    3. Possible development of hazardous fumes, gases, or dust according to the metals involved.
    4. Location of welder’s breathing zone with respect to the rising plume of fumes.
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