Plan and section details for a roof hatch access assembly. The plan view shows a 3-foot by 3-foot polycarbonate clear dome surrounded by a self-closing safety guardrail, positioned with specified dimensions from the face of the parapet. A guardrail framework extends around the opening with an overall width of 3 feet 10 inches and an overall depth of 4 feet. The adjacent section view details the top ladder section meeting the upper mounting ring below the roof opening. Dimensions indicate clearances and spacing for the ladder rungs and mounting brackets.
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