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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.
4- Then, from outside the building, slide a short chimney length (attached to the tee)
through the wall thimble. The chimney must extend at least 3 inches into the living
space where it attaches to the stove pipe.