NTO spiral ducts are manufactured of galvanized steel. Standard lengths are 3 m and 6 m. Ducts can also be manufactured of other materials and in other material thicknesses.
Spiral ducts meet the requirements for cleanliness class M1 and tightness class D.
|Lenght||2000, 3000, 6000 mm|
|Material||Zn, ZM, H|