Sometimes referred to as "Triple Wall Pipe" chimney pipe, most factory built chimney pipes are now double wall chimney pipe with an insulation pack between the two. Some codes still require a triple wall chimney. The triple wall chimneys of today have an insulation pack between the inner layers and an airspace between the outer. In either case they are generally considered "Class A" chimneys used for high-temperature exhaust gasses from common solid fuels such as: Wood, Oil, Coal, and other high-output fuels. The advantages of the insulated style of today is the reduction of creosote because the inner-most layer of the pipe gets hot quickly and stays hot throughout the burn (see FAQ's for importance of insulation). It also creates a better draft and therefore more efficient results from the appliance, and reduces clearances to combustible materials around it. Some models still use a triple wall design but now use the insulation between the two innermost layers to achieve a similar result.

Double wall Chimney Pipe

Simpson DuraTech (Made in the USA)

5 Inch Duratech        6 Inch DuraTech         7 Inch DuraTech

 8 Inch DuraTech        10 Inch DuraTech

Selkirk Metalbestos (Metalbest)

   6 Inch Metalbestos        8 Inch Metalbestos

 Supervent / SuperPro (by Selkirk)

6-Inch Supervent / Superpro

Triple Wall Chimney Pipe

Simpson DuraPlus (Made in the USA)

 Six Inch Duraplus                       Eight Inch Duraplus

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