Corrugated spiral pipe
Round duct shaped by an helicoidal galvanized strip, with two veins reinforcing the center, which gives greater rigidity to the duct.
*Galvanized steel finish.
*Nones diameters available 9,11,13,15,17 and 19".
*Available with internal insulation DuctLiner 1" thick and other.
* Union by couplings, clamps or flanges.
Advantages: allows to use thinner gauges than in flat spiral duct for the same diameter, this being a cheaper option in some cases.