Ceiling Lights Junction Box : 4" Octagon boxes come in 1-1/2", 2-1/8" & 3-1/2" depths ... : If it's a box for a light fixture, he can put in an old work box, but he needs to make sure he buys one that is rated for use to hold a light fixture.
Ceiling Lights Junction Box : 4" Octagon boxes come in 1-1/2", 2-1/8" & 3-1/2" depths ... : If it's a box f...