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double wll pipe
double wll pipe  
Where does the air come from to provide cooling of the space between the inner and outer wall of the double wall flue pipe.  Should there be an outside source as there is for the fire box?

Hello Bruce, the box the fire box sits in is not air tight, so the air for the double wall pipe comes from that  area around the box and no  you do not need out side are for it, read the install instructions that should have all the info you need to install that type of chimney.
Hope this helped

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James Ball


I am a chimney sweep with over 22 years of experience, CSIA certified and member of the NCSG, I can answer questions about smoky fire places, wood stoves, and heating units (boiler and furnace chimneys) do you need a relining? A cap? And much more


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Chimney Safety Institute of America, National Chimney Sweep Guild

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