I live in Orange County to be specific and just re-keyed my friend’s new warehouse. There were 3 doors in the back and all 3 had a set of lever and deadbolt. One of the lever was falling apart and old so I replaced it with a commercial grade entry doorknob I had and it fit fine. There is an exit sign in the back. After I got home, I started to worry about regulations and such. Is it ok to have a doorknob for the back of the building?