Answer:
1. Two stairwells are needed for facilities of more than 2,500 square feet per ground less than 5,000 square feet per ground. An extra staircase is required for every additional 5,000 square feet per floor.
2. A third staircase may have taken some extra floor space.
3. Both doors heading in or to every other workplace shall be built as to open externally, where possible, and should not be closed, barred, or bolted throughout operating hours.
4. There must be metal railing, metal windows doors, and brick or concrete walls for buildings above 150 feet long. There are no such criteria for buildings under 150 feet long.
