What is the difference among single wall, double wall and class A chimneys?
A. 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. Class A chimney is double wall pipe but instead of an air space, it is packed with high heat insulation, which can handle more heat. Class A chimney is used in the attic and outside of the home.
