1- Start by positioning your stove where you would like it to go, taking into account the minimum clearances to combustible material. You will then be able to determine where the chimney will pass through the wall. You will probably have to adjust the stove position slightly to ensure that your chimney will run between the studs. You can use a stud finder to locate the studs. Use a spoke saw or jig saw to cut a hole, remembering that you need to maintain a clearance of 2 inches between the chimney and any combustible materials. For concrete walls, cut a hole slightly larger than the outer diameter of the chimney.
2- Once the opening completed, you need to frame in the area to allow for the installation of a wall thimble. A wall thimble is not required for installations through concrete walls.
3- You must first secure the wall thimble into the exterior wall surface. Then, do the same inside and fasten the trim plate.