What do you guys use to support your ventilation ducting? I have thick insulated ducting that's about 12-14 in diameter and need it mounted along the ceiling (and finding studs is a real pain with my popcorn ceiling; I have to punch holes with a nail because the stud finder can't accurately find the joists.
Get a pack/roll of iron band strapping, its the most easy to use. Or those really big zip ties with the hole in them for a screw.
If it will fit, I made some wire coat hangers into hoops and ran it through them, then you just hang the hanger from whatever.