Material：

Galvanized steel Plate (g)

Size：

∮150mm ~1800mm

The standard length is 3M and can be set to length.

Characteristics：

Swiss Spiro Standard Arc seam, combined tightly, gas density is excellent.

In the middle of the spiral seam, there are three Swiss Spiro reinforcing type reinforcing ditch.

The use of flying-type cutting, no burrs, construction safety.

High strength, light weight, convenient construction.

It is applicable to the use of the wind duct and the construction pretension beam with weight concern.

In line with the United States Sheetmetal Association (SMACNA), the United States (ASHRAE) and Germany (DIN) Spiral duct manufacturing standards.