A Summary of Wood Stove Pipe
The function of wood stove piping (also known as connector venting) is to connect the appliance to an approved chimney system. Stove piping is never used as a chimney system and is never installed through a wall or combustible surface. To penetrate a wall or ceiling or any combustible surface a specialized insulated component must be utilized.
Wood stoves may not utilize galvanized pipe. Galvanized pipe off-gases toxic fumes at temperatures commonly found within wood stove venting and it is not safe for wood stove venting.
Hardware store grade wood stove piping is usually 24 gauge (the higher the number the thinner the pipe). 24 gauge piping is the minimum thickness called for by the NPFA 211 code for wood burning stoves. Some hardware venting is formed, meaning the seams on the lengths are sealed but it more common to find the snap together lengths.
Most hearth specialty stores stock 22 single wall gauge black stove pipe. This high quality, heavy gauge stovepipe has spot welded seams and is approximately 30% heavier than 24 gauge lasting several years on most installations.
The newest type of wood stove connector venting in the hearth industry is known as double wall black interior stove venting. While this pipe resembles the 22 gauge welded pipe, it often allows for much closer clearances to combustible surfaces and is simple to install with telescoping lengths. Always refer to the appliances installation manual to determine approved clearances of venting options. Most manuals will list clearance requirements for the appliance using either single wall pipe or double wall interior pipe.