What is the difference among single wall, double wall and high temperature chimneys?
Single wall stove pipe is a single layer of steel mostly used with wood stoves. Double wall stove pipe has the same use, and has an air space between an inner pipe and outer pipe, which makes the outer portion of the pipe cooler, enabling your stove to be closer to a combustible surface. High Temperature Class A chimney is double wall pipe but instead of an air space, it is packed with high heat resistant insulation, which can handle higher temperatures.
