The ICC EXCELDirect Vent co-linear adapter is designed for freestanding gas stove installations that will use a masonry chimney.  Designed to fit 4x7 EXCELDirect, the built-in trim of the MAC is painted with Stove Bright Flat Black paint.  Depending on the size of the existing thimble, some small masonry removal may be required, but the MAC has been built to the absolute minimum dimensions possible.