The Exclude Boundary feature is used to remove boundaries from the boundary element problem. The selected boundaries will neither contribute to the assembly of the BEM problem nor to the solution. The condition can be used to set up models where the BEM interface is used as an ideal infinite domain in an infinite baffle (infinite half space) setup when coupled to the Pressure Acoustics, Frequency Domain. In these models, all boundaries of the FEM problem need to be excluded, except for the ones in the multiphysics coupling.