The drawing illustrates a floor opening for a mechanical shaft with detailed dimensional callouts for the floor opening and surrounding layout. It includes a 4'-10" by 4'-10" floor opening designation and alignment dimensions relative to grid lines and structural elements. The diagram uses standard architectural dimension lines and tags to specify placement.
Text on the drawing
15' - 11" 7' - 10" 1S2 MECHANICAL SHAFT FL. OPNG. 4' - 10" 1' - 10" 18' - 5" FL. OPNG. 4' - 10" 6' - 10" 7' - 9" 6"
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