Ceiling electrical boxes come in different depths: 0.5", 1.5", 2.25", 2.75" seem to be fairly common. I'm going to be hanging some lights as well as ceiling fans. I want to have the boxes as shallow as possible in order to keep the service chase shallow.
How do I determine how deep of boxes I need? I'm looking at 1.5" deep boxes -- in what situations would I need to use boxes deeper than that?