I'll be assembling the ductwork for my Oneida 2.5HP Gorilla in the next couple weeks. It appears that I'm able to locate 26 gauge spiral pipe locally for a better price than any online snap-lock pipe. However, I'll be purchasing my lateral wye's from Oneida and my adjustable elbows from KenCraft.
I've looked all over the web as well as this forum for some clarification on spiral pipe assembly. Everything I've found says that fittings are inserted into the spiral pipe on both sides rather than crimping the downstream end of the spiral pipe. Do I need to crimp the upstream end of the fittings for insertion into the spiral pipe? Doesn't this cause a friction point? How have others here assembled their spiral pipe?