Spiral circular ducts in aluminum, stainless steel, copper and galvanized sheet.
All tubes produced by on an original tubeformers machine of SPIRO INTERNATIONAL S.A. bear the SPIRO®system registered trademark.
This guarantees the high quality of the system.
They can be supplied with reinforcing rib Ød = 250 mm.
The rib is standard from Ød = 450 mm.
These ducts are produced as standard in galvanized sheet metal and comply with the UNI EN 12237, UNI EN 1506 and UNI EN 13779 specifications.
Suitable for “D” SEAL CLASS systems.
