General and passive versus active FP
General and passive versus active FP
Quite naturally "egress" was the notation used in the original post. Egress has three parts,1. exit access, 2. Exit, 3. egress outside the building to a public way.
The likely hood of remote versus local location in concept of where a calibration shop is tied to material when energy is prevalent. Often small heaters are used and electric overloads or heat, products of combustibility, oxygen, chemical reaction may exist. The risk taken is entirely up to a code authority mentioned in my response.
However just for a quaint understanding the vapor phase of liquids or solids have a vapor flash point governs where in an egress path certain occupancy are allowed to exist in a building , certainly does not leave it up to anyone but qualified what I suggest as his code authority. I feel certain his organization will arrive at the top of the stairs and determine the characteristics of "egress" not under it and by the by the square foot area provided is so trampling does not occur in the stairwell, certainly never intended to mention people standing around under a stairwell when the building is on fire, does that make sense to the person asking in red. I have the notion you should chill out.