Anyone fished 12v wires through the ceiling joists?

I just did this same thing. I didn't want to hook into the switched ceiling light right next to kitchen vent. I used a fishing pole with a section of string attached to the last ring to pull the tip down into joist openings. Worked like a champ after an hour of using plain old fish tape. I went to the bathroom vent for power, and added a second Fantastic fan there.