Product review (5 stars): Nice job, but>>>
Works great for mostly straight pipe.  Doesn't work well for 90 degree bends where the duct enters the wall.  I went into the attic and separated the pipe and took that into the garage.  Used the shop vac to roto rooter that run of pipe.  Then, went into the attic and ran the roto rooter from the top down of that pipe run.  I nearly filled up my 10 gal shop vac.  Dryers working great and drying as fast as possible with nearly 20 ft. of pipe to the roof.  About 10 ft. too much for most any dryer!!!