Material：

Galvanized steel Plate (g)

Stainless steel plate (s)

Size：

∮75 mm ~1800mm

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

Characteristics：

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

The Helix spacing is small (p=120mm), the intensity is especially high.

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

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