iam working on an aircraft hangar design , iam asking about exit stairs required by NFPA 101 (40.6) or 409, Are they should be enclosed or it may be open stair specially they are only between ground and mezzanine floors
It looks like you are working on a aircraft servicing hanger according with Section 40.6 of the 2018 NFPA 101>
The words in Section 40.6.3 ",and such means of egress shall lead directly to a properly enclosed stairs discharging directly to the exterior, to a suitable cutoff area, to outside stairs."
This section means to me that there are three options for the means of egress from the mezzanine floor must lead directly to:
Consult Section 220.127.116.11 and the referenced Section 7.2.2 for the provisions for the enclosed and outside stairs. Section 18.104.22.168.1 allows noncombustible grated stair treads and noncombustible grated landing floors.
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