Arlington FA104 Switch/Outlet Box, 4-Gang, Adjustable, Depth: 3-9/16", Non-Metallic

Arlington's non-metallic adjustable round ceiling boxes are the answer to secure joist mount fan or fixture installations in new construction both are ul and csa listed with a two hour fire rating and both ship with an installed NM cable connector designed for fan and fixture installations in new construction FB a 426 comes with captive installation screws it's also preset for a half inch ceiling thickness but adjust after the ceilings in place up to one and a half inches for varying ceiling thicknesses like single or double drywall it's rated for a 70 pound fan an hundred pound fixture and complies with the NEC be a 426 to a joist with the four screws provided to through the support tabs and to through the front flange slide the plastic insert into the box pull the cable through the installed connector and after the ceilings in place adjust the Box depth if necessary then use the capti