The drawing shows a floor opening (FL. OPNG.) dimensioned relative to gridlines and structural members. It includes dimensional strings indicating offsets and sizes, along with a detail/section tag (1S2) referencing the structural elements.
1S2 8' - 4" FL. OPNG. 4' - 6" 1' - 9" 1' - 6" FL. OPNG. 4' - 6" 9" 7' - 6" 6' - 9" 1' - 2"
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