Hi All : possible sources of stove pipe, old houses, fire damaged houses, demolition jobs, watch for boarded up windows on the 1st floor and really large demolition trailers, the kind that most come loaded on the back of a large truck, check with contractors esp. those that have HVAC in their descriptions in their ads. Check with
local Fire fighters, as a group you will find a lot have skilled crafts as a hobby or side job and be willing to talk to you.
Once you pick a stove pipe size, you can use any stove pipe, old and rusty is not bad, its basic-ly a form around which you'll pack cob, stone, and Urbanite. The hot air flues and cold air returns
May be a lighter weight thats fine . I have never used Aluminum piping, though I have found it in some House/Rv Trailers it must be regional , again they are just a form you will use and if you crush it you might be able to straighten it out again , Grab every Elbow and "T" you can find, even the draft corrector, you can even make a "t' out of that !
I would patch any holes and all the joints, you decide, tape and/or R.T.V silicone sealant, you will be using some Clean-outs weekly and all of them yearly so when you fasten them together ( after a dry fit 1st! ), use Short self tapping screws, or rivets , you will hate yourself if you don't, and wont give it a thought if you had ! Hope this helps , Pyro - maticly yours Allen L.