Natural Lighting

The operator shall provide for each room used for human habitation (A) transparent or translucent glass or other equivalent materialwhichadmits light fromthe outdoors and which is equal in area to no less than 8% of the floor area of that room, and (B) windows, doors, skylights, or transoms in the exterior walls or roofs that can be easily opened to a minimum of 4% of the floor area of that room; provided, that a skylight which, if open exposes the interior of the dwelling to direct rainfall shall not qualify.