Furnace chimney

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Hello everyone I am trying to figure out if this duravent double wall pipe is suitible to be used for a 20 foot run outside my house?

http://m.homedepot.com/p/DuraVent-D...Chimney-Stove-Pipe-in-Black-6DVL-48/202269780

No. That is connector pipe. Every thing from the FIRST wall or ceiling penetration & all the way to the chimney cap has to be Class A CHIMNEY Pipe.

The second question I would have is once I get above my roof line and have over 18 inches of clearance can I go back to single wall pipe?

No. See above.
 
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