Where Not to Install
An extremely important requirement when installing a stovepipe is where not to install it. You should not install a stovepipe through a hole in a window, a ceiling or even a floor. Doing so can result in a fire. The extreme heat from the pipe could cause combustible material in the building to smolder and catch fire.
Thickness of the Pipe
The thickness of the stovepipe is important. The gauge of the metal for stovepipes is either 22 or 24-gauge. Any metal thinner than 22-gauge cannot handle the heat emanating from the stove and passing through the pipe. Whether you have a pipe with an enamel finish to match the stove is up to you, as long as you meet the thickness requirement. You can have a double-wall stovepipe, which consists of two layers of pipe separated by a cushion of air. The outer pipe, also 22 or 24-gauge, is often black with heat-resistant paint.
To allow the smoke to travel as easily as possible through the stovepipe, you want to have the run of the pipe as straight as possible. This means you want to reduce the number of curves in the pipe. You can buy a 90-degree elbow pipe fitting, which will allow you to have a straight run from the stove into the bottom of the elbow, then have another straight run extending up the chimney. Elbows come in two variations: the curved elbow, which resembles a "c" as well as the 90-degree elbow, which resembles an "L."
Distance from the Wall
When installing a stovepipe, keep it a safe distance from anything combustible. If the stovepipe is single-walled, it must be 18 inches from a wall. If the pipe is double-walled, you can install it as close as 6 inches from the wall.