Grease Exhaust Duct Friction
Grease Exhaust Duct Friction
(OP)
I am looking for friction information on grease-laden welded black iron ductwork for a kitchen hood exhaust. I need to have a certain static at the hood collar and am trying to size up the roof fan. Something tells me that most people just use the galvanized ductulator slide rule for this type of application, but it that acceptable? If not, what is typically used to size grease exhaust ductwork and calculate required fan static?





RE: Grease Exhaust Duct Friction
RE: Grease Exhaust Duct Friction
RE: Grease Exhaust Duct Friction
RE: Grease Exhaust Duct Friction
http://www.lmnoeng.com/surface.htm
RE: Grease Exhaust Duct Friction
Why are you making a grease duct out of Black iron , I have always made them out of 14guage welded galvanized sheet.
If you are relying on the grease in the duct to protect the iron , it does not work, there is always some moisture and the ducting rusts. So at the very least you will need to paint the duct, then calculate your friction for a painted surface.
B.E.
You are judged not by what you know, but by what you can do.
RE: Grease Exhaust Duct Friction
RE: Grease Exhaust Duct Friction
You are judged not by what you know, but by what you can do.