Moved residences and my shop recently. Before, I used 5" metal hvac ductwork on an 8 ft ceiling in a 280 sq ft shop. Worked great. Now have a shop that's over 900 sq ft and a 10 ft ceiling. Was looking at Unistrut channel for mounting ductwork on ceiling as i can move brackets back and forth in the channel to make things align to the drops to the machines. I don't find a Unistrut accessory that handles 5" or 6" ductwork. Is there one out there that I'm not finding? Anybody use unistrut for their ductwork? I found 10 ft lengths of aluminum channel 1 5/8" x 13x/16" for $31. Not too bad as I shouldn't need very much of it. Planning on using thin wall PVC this time. Found the piping in 20 ft thin wall sections locally but not thin wall 45 degree angles and couplers. They are all schedule 40 from what I find. Does anybody know if they make thin wall connectors and 45s to go along with the straight sections? Randy