Really underground garage
Join Date: Aug 2010
Location: mnts of Va
Irrespective of diameter,flex...and the more rough,tall the "ribs"...the more it kills airflow.
So anywhere you can get rid of it,the better the systems work.It is a fact of DC,shoplife however.But limiting it's use...for instance,if your setup has to have a bend,coming out of a machine port....then flex is not as bad as it would be in a straight section.Because of the way the airflow is disrupted in the bend anyway.It still isn't as good a smooth bend,just doesn't give up as much as a straight section.
I'm not a Bill Pence groupy,yes he's moved dust management ahead a bit.But applied science is just as valuable as theory when it comes to DC parts.Mr Bill,buys "over the counter" parts.If he'd step UP to the world of fabrication,I'd bet a chicken dinner some of his data would change.
Port design and velocities may look great on computer models,but that ain't the last word.
Look into or for an auto exhaust shop,for metal tubing under 3".Not condemning plastic(well,a little),but metal tube and ducts open up way more options,just sayin.
And,best luck on your system.Got the same blower sitting on the shop floor.Mounting it upside down on shop ceiling(heavy,haha).