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[skorpyd]

Hello,   I'm getting my materials together to build my OWB,   I'm using 1/2 500 gal propane tank for the firebox, and 1/2 1000 gallon ammonia tank for water jacket.  I found some heavy walled pipe that is a bit under 6" ID, 
Is that large enough for use with a forced draft?
I am also wondering about the pros and cons of taking the stack out the top like you see on most of the commercial boilers, vs out the end and using a saddle T connection with a clean out.
What about depth of stack inside box or baffle systems.   
Any opinions, Thanks

[jackel440]

6" will be big enough for the exhaust stack.
The choice of exit locations is up to you.either have thier pros and cons.Straight up is easier less work involved.Out the back would help keep rain water from entering if you don't have it running and no rain cap.
You might want to post this project over in the homemade section.You might get more eyes on it over there.good luck