Grant even though the codes are primarily used in the building commissing. It is still important to know these officials as well because they are the ones that approve the systems before we get to them and if they know what to look for and enforce the codes properly hopefully we won't have to deal with boughed ducts, improper runs of duct, bad hood installs, faulty supression systems, etc. As a contractor by trade I have dealt with these guys for years and trust me being nice and friendly to them can go very for you in the working world.