1. restricted areas in the building must have at least one of the following characteristics:• The open system not yet complete enough to release the toxic polluting gas or oxygen deficient atmosphere.• The regional approach difficult due to location or magnitude of the entrance or the means to move out on short and limited.• The area is not designed for continuous working staff.• The area may contain material can sink, set traps other measures to limit the intentional out into the area to perform the task.
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