Strengthening beads ensure a stiffer, round elbow and a better seal.
All elbows come standard with one end crimped. Ideal-Air adjustable elbows are used to make turns in the round pipe and flexible duct through -- but doesn't have to be -- 90 degrees.
They have a sturdy galvanized steel construction and are simple to adjust.
Caution: Section edges are sharp. Don't cut yourself while adjusting it.