Circular ducts are the most used in standard installations. For all types of fluids (gas, air, water, etc.) these are the conduits that offer less friction and greater ease of flow. They require less material, and as such are lighter, making installation more economical in terms of fastening accessories.
Helical tube manufactured by automatic machine from coils of galvanized sheet Z200 or stainless steel with a width of 137mm. Manufacturing thicknesses are 0.4/0.5/0.6mm. The standard length of the tubes is 3m. The crimping, in addition to keeping the tube smooth on the inside, complies with all standards regarding watertightness.