[joshmccraney]

Suppose I have a house with a slanted roof like most houses are, which I call "house". On the top of the house a chimney sits, which I call "chimney", though the chimney is lower than the peak of the house roof. I would like to mesh the house interior as walls and the chimney being an outflow boundary. My blockmesh looks like this

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  4.0                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 0.001;

//These vertices define the block below. It envelopes the stl files. The block can be even bigger than the stl files
//Watch out if the stl files are created in mm or m!

xmin 0;
xmax 15;
ymin -2;
ymax 30;
zmin 0;
zmax 160;

xcells 19;  // 11
ycells 39;  // 41
zcells 200; //128

vertices
(
    ($xmin $ymin $zmin)
    ($xmax $ymin $zmin)
    ($xmax $ymax $zmin)
    ($xmin $ymax $zmin)
    ($xmin $ymin $zmax)
    ($xmax $ymin $zmax)
    ($xmax $ymax $zmax)
    ($xmin $ymax $zmax)
);

blocks
(
    hex (0 1 2 3 4 5 6 7) ($xcells $ycells $zcells) simpleGrading (1 1 1)
);

edges
(
);

boundary
(
    house		//Adjust these settings according to symmetry patches. Currently none invoked
    {
        type patch;
        faces
        (
            (2 6 5 1)
            (0 3 2 1)
	    (4 5 6 7)
            (3 7 6 2)
            (1 5 4 0)
        );
    }
    chimney		//Adjust these settings according to symmetry patches. Currently none invoked
    {
        type patch;
        faces
        (
            (3 7 6 2)
        );
    }
    base		//Adjust these settings according to symmetry patches. Currently none invoked
    {
        type patch;
        faces
        (
            (1 5 4 0)
        );
    }
    symm_side		//Adjust these settings according to symmetry patches. Currently none invoked
    {
        type symmetry;
        faces
        (
            (0 4 7 3)
        );
    }
);

// ************************************************************************* //

But when executing I get the error
--> FOAM FATAL ERROR:
Trying to specify a boundary face 4(3 7 6 2) on the face on cell 0 which is either an internal face or already belongs to some other patch. This is face 0 of patch 1 named lid.

Any help is greatly appreciated!

[joshmccraney]

Nevermind, looks like I defined the same face twice.