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Minimum levels of supervision
Perimeter Considerations Grade 1 Grade 2 Grade 3 Grade 4
Doors O OP OP OP
Windows ÌýO OP OP
Other opening sections ÌýO OP OP
Walls ÌýÌýÌýp
Ceiling/Roofs ÌýÌýÌýp
Floors ÌýÌýÌýp
Room T T T T
High risk objects ÌýÌýS S
Key to chart: O = opening, p = Penetration, T = trap, S = object requiring special consideration