Venting thru my ceiling

I'm in a 2 story condo. And I wanna cut a hole in the ceiling on the second floor for my exhaust. I do have a "attic" but it's not over the room I wanna garden in. At least I can't see it.
Amy advice?

Can you use the bathroom fan vent? I cut a hole in my ceiling and ran my exhaust to the fan vent

The bathroom fan vent is a 4" hose so I bought a reducer for my 6" and connected the reducer straight to the pipe leading to the roof.

You really should not vent into an enclosed space, although your roof is likely vented. The idea here being that moisture from your grow gets exhausted into your ceiling and can potentially cause issues. The best way would be to find a way to vent directly to the atmosphere.

Even if my humidity is really low all year round?
And i cant vlget too my bathroom vent.
If i could ehaust straight out the window i would but it looks to obvious.

if you vent through your ceiling go buy ducting and take it to the end walls of most house have vents or straight to the peak were there should be ridge vents in roof that would be better then just going in open space in attic also some roofs have the spinning cone thing that also would work good