From my amateur knowledge, totally fine, this is what bulkheads usually enclose. But a few things to mention. If you have any junction boxes in there, you need to maintain access to them through an access panel. Also, I'd add some protection from someone screwing something into the ceiling and hitting one of those lines. Someone put a screw through my central vac line and I can't use one of the outlets now as it always gets clogged due to the screw catching all the crap being sucked through.