/*--------------------------------*- C++ -*----------------------------------*\

| =========                 |                                                 |

| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |

|  \\    /   O peration     | Version:  2.2.0                                 |

|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |

|    \\/     M anipulation  |                                                 |

|*---------------------------------------------------------------------------*|

|  File created by CFD support s.r.o., Tue Sep  3 08:33:52 2013               |

|                    http://www.cdfsupport.com                                |

\*---------------------------------------------------------------------------*/

FoamFile

{

    version     2.0;

    format      ascii;

    class       dictionary;

    location    "system";

    object      topoSetDict.baffles;

}

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

actions
(
{
name MRFZone;
type cellSet;
action new;
source boxToCell;
sourceInfo
{
boxes ( (-100 -100 -100) (100 100 100));
}
}
);

Run the topoSet utility:

# topoSet -dict system/topoSetDict.mrf