[mihaipruna]

I tried this, but, after meshing, looking in the boundary file it generated, all the STL patches are walls!
SHM:

sduct.stl
{
type triSurfaceMesh;
name sduct;
regions
{
Sductface1
{
name Sductface1;
type wall;
}
Sductface2
{
name Sductface2;
type wall;
}
SDuctInlet
{
name SDuctInlet;
type patch;
}
SDuctOutlet
{
name SDuctOutlet;
type patch;
}
}
}



Boundaries:

Sductface1
{
type wall;
nFaces 139535;
startFace 2352772;
}
Sductface2
{
type wall;
nFaces 13938;
startFace 2492307;
}
SDuctInlet
{
type wall;
nFaces 13938;
startFace 2506245;
}
SDuctOutlet
{
type wall;
nFaces 136863;
startFace 2520183;
}
)