The roaring fire in the wood stove keeps the room toasty warm on a wet, cold night. For safety, the single- or double-wall black stovepipe transitions to class A chimney pipe once it nears a wall or ceiling. Class A chimney pipe is a double- or triple-wall structure, with insulating material between the walls, or in the case of triple-wall chimney pipes, between the middle and inner walls.
The Transition
Black stovepipe is only used in precisely the exact same area as the stove. It radiates heat and needs a minimum of 18 inches of clearance from the wall. A ceiling support box transforms the stovepipe into the type A chimney flue. The ceiling support box must extend into the room and under the finished ceiling by a minimum of two inches. If the chimney pipe is set up horizontally through the wall, then it passes through a special flashing called a thimble. Double-walled black stovepipe must be kept 6 inches from combustible wall fabric as it connects with the chimney pipe; to get single-wall stovepipe, the clearance space remains 18 inches. The chimney pipe and stovepipe are linked with a stovepipe adapter.
Chimney Pipe Clearances
A class A chimney pipe takes less clearance compared to a single- or double-wall stovepipe, which is only intended for use inside precisely the exact same room as the stove. Within the home, a chimney pipe must be encased in which it passes through the living space. Within the enclosure, building codes need a 2-inch clearance around the double- or triple-wall chimney pipe. While a double-wall class A chimney pipe is acceptable for many installations, wood stoves installed in mobile homes are needed to use a triple-wall chimney pipe.