Arlington’s IN/OUT BOX for fans, ceiling fixtures is pre-set for 1/2" ceilings but adjusts up to 1-1/2" for varying ceiling thicknesses, ie single or double drywall.
Always accessible screw allows for depth adjustment after
the ceiling's installed.
Complies with 2014 NEC, 314.20 for set back boxes.
Securely joist-mounting in new construction.