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Where openings below grade provide required natural ventilation, the outside horizontal clear space shall be one and one-half times the depth of the opening. The width of the horizontal clear space shall be maintained from grade down to the bottom of the lowest required opening.

Related Code Sections

1202.5.1.2 Interior Environment, Openings Below Grade
Where openings below grade provide required natural ventilation, the outside horizontal clear space measured perpendicular to the opening shall ...
1202.5.1.2 Interior Environment, Openings Below Grade
Where openings below grade provide required natural ventilation, the outside horizontal clear space measured perpendicular to the opening shall ...