[Carno]

Dear All,
I am trying to mesh an enclosure. I am using a closed volume for volume meshing and extracted surfaces for creating patches. There is 1 inlet and 1 outlet.
The problem is, if I mesh the volume without surface STLs as patches it meshes perfectly. As soon as I use extracted STL surfaces as patches it leaks, the same volume STL. I am attaching the two cases pictures.

geometry
{
    fixed.stl
    {
        type triSurfaceMesh;
        name fixed;
        regions 
          { 
              CFD_VOLUME_08             // Named region in the STL file 
              { 
                  name wallsassy; // User-defined patch name 
              }                       
          }
  
    }
    inlet.stl
    {
        type triSurfaceMesh;
        name inlet;
    }

    outlet.stl
    {
        type triSurfaceMesh;
        name outlet;
    }
/*    canopy.stl
    {
        type triSurfaceMesh;
        name canopy;
    }*/

As soon as I activate the canopy.stl, it starts leaking.
Kindly help..