Non-Manifold to Manifold

Grasshopper Developer
#1

Hi , i was searching for how to remove faces that make a mesh non-manifold .
any help ?

Manifold
Manifold.JPG881×790 73.2 KB

I have tested he mesh so far
Manifold.gh (9.6 KB)

#3

mesh.ExtractNonManifoldEdges(false);