R 408.10673 Exposure to fire escape stairs.

Rule 673. Fire escape stairs shall be so arranged that they will be subject to exposure by the smallest possible number of window and door openings. Every opening, any portion of which is within the following limits, shall be completely protected by approved fire doors or metal frame wired glass windows, as follows: (a) A horizontal opening if within 15 feet of a balcony, platform or stairway constituting a part of the escape proper. This does not apply to a platform or walkway leading from the same floor to the escape proper. Protection need not extend around a right angle corner (outside angle 270 degrees) of the building. (b) An opening below if within 3 stories or 36 feet of a balcony, platform, walkway or stairway constituting a part of the escape proper, or within 2 stories or 24 feet of a platform or walkway leading from any story to the escape proper. (c) An opening above if within 10 feet of a balcony, platform or walkway, as measured vertically, or from any stair treads, as measured vertically from the face of the outside riser. (d) An opening on a top story. Protection for wall openings is not required where stairs do not lead to the roof.