... ”,9”,10”,12”,14”,15”,16”,18”,20”Inside Bend Radius (inches)................... ..........................1/2 x I.D. (All Sizes)Rated Velocity ... . positive. 10” w.g. negative thru 12” Dia. 5” w.g. negative, 14” & 16” Dia. 1” w.g. negative, 18” & 20” Dia.Minimum ...