A facility is looking to replace the existing boilers and the existing exhaust stack that goes up and out of the building does not appear to be a viable option.
There is an old steam tunnel entrance that would allow the exhaust to pop up >6 feet away and outside of the building in their private alleyway. There are no operable windows/etc nearby. It would be >10 feet high and have a chimney fan to dramatically reduce the temperature
As far as i can see, it complies with IMC 501 but NFPA 211 seems to indicate it has to terminate above the roof.. I'm not sure if or how this applies in my situation where the owner owns multiple buildings and private roads/alleyways, but want to see what the greater community thinks.