3-1/2" deep, 4" square junction boxes with ceiling deck side flanges and (8) 1/2” & (8) 1/2”-3/4” side knockouts and a raised ground are installed in ceilings where extra depth is needed for dimmers, cameras, speakers, strobes, signals and other electrical and electronic devices. Their dual mounting flanges allow a direct mount to steel ceiling deck pans and eliminate conduit offset bending. Each conduit runs directly to a knockout across the top or down in the cavity of the ceiling deck pan grid. They fit in all newer deck pan ceilings. Garvin Industries’ labor saving design eliminates the need to awkwardly install boxes and extension rings to accommodate deep devices.