On Wednesday, November 9, 2016 at 2:53:20 PM UTC-5, Bob Engelhardt wrote:
On 11/9/2016 2:19 PM, Carl Ijames wrote:

... "duct hose" ...

I had an experience with duct hose. I built a leaf vac and tried a
variety of scrounged hoses on it. The very poorest performer was duct
hose. It lasted about 20 minutes before the leaves, twigs, & bits of
this and that wore through the wall.

I was cheap, but eventually I did buy the real stuff ($7 a foot, IIRC)
and it was worth it - after 10 or 15 years it is still in use, but has a
few tears.

Bob

What is the "real stuff?" I'd like to extend my shopvac hose, but adding lengths of corrugated stuff really reduces the airflow. If I could trade some flexibility for a smoother bore, that would be worth looking at.