CYLINDRICAL DUCTS
Straight cylindrical ducts with longitudinal joints and plug connections at the ends thereof.
Straight cylindrical ducts with longitudinal joints and double joints at one end and simple at the other.
Circular connecting pieces such as transformations, reductions, pants, tee, derivations, and others.
They can be realized with both systems of union to plug as well as double-simple and the alternative with flanges of flat iron or angle.