J'ai retiré ma réponse : il ne s'agit pas de serpentins, mais de "ducts", de gaines de climatisation en "coiled sheets"

"Formtek Iowa Precision Industries Pro Fabriduct coil processing duct line complete to the following specifications:

4 x 1525mm x 5 tonne Decoilers featuring individual hydraulic drives with hydraulic hold down arms

Bottom pay off via auto grid feed to auto select station and infeed table to processor.
Pro Ductomatic processor unit to 1525 x 1.6mm material and features SMACNA beader.
Notching heads for drive cleat, TDC/TDF, Pittsburgh and Snaplock.
Hydraulic shear cut off and forming head for male Pittsburgh and Snaplock.
3 metre transfer table to female Pittsburgh station.
Mark-XV rollforming station for Pittsburgh and Snaplock female seams.
3 metre transfer conveyor and positioning to TDC/TDF forming station.
14 station TDC/TDF Duplex rollformer for 35mm flange.
Feed table to wrap brake.
Wrap brake and 3 metre runout table.
CNC fully programmable touch screed from centrally located control console.
Line offered and U shape configuration and occupy floor space approximately 6.8m x 16m. You to advise whether line to run right hand U or left hand U direction.
Power requirements: 125amp, 415v, 50Hz
Air requirements: 15cfm at 90psi."
http://www.kleen.com.au/_webapp_1083355/Duct_Manufacturing_C...

Please Click the Links below to see the Coil Line in action:

http://www.youtube.com/watch?v=YeQJtsY187Y&feature=related

"http://cogeve.com/pdf/gaines_rectangulaires.pdf - Translate this page
La gaine est en tôle d'acier galvanisé de qualité Sendzimir Z275g d'épaisseur selon la section suivant ... Etanchéité par faite de la gaine dans la masse d'étanchéité. Gaine rectangulaire ..... Gaines de ventilation et climatisation. • "