I am in California. We are using UBC. Refer to UBC-section 905 for different methods: Pressurization or exhaust. I did lots of Atria using exhaust method 'cause it's cheaper in construction cost and it's easier to achieve. Good luck.
Your application sounds similar to Perchloric Hood application. FRP duct is an appropriate system for this application. Your should have one dedicated exhaust ductwork per hood (cannot combine exhaust ductwork into one main). Your duct system should be run vertically with only one horizonal...
You can check UBC for all requirements regarding elevator shaft and elevator machine room. If the elevator be designed to operate for (3) floors or more, a hoistway shall be required. Size of the opening of the hoistway should be checked with the UBC. Elevator machine room will only need...