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Utility Tunnel

Question asked by archnada on Sep 8, 2020
Latest reply on Sep 9, 2020 by archnada

I have a utility tunnel (chase) connecting an underground energy center to a shared basement that is connected to above ground office buildings. the tunnel is 90m long 4*5m cross section accessible for maintenance staff - my question is do we need to enclose this tunnel on either side by fire rate partition/doors since it is a corridor connecting two different occupancy buildings or it can be left open - couldn't find much on these utility tunnels in NFPA - a code reference would be much appreciated also