Air Flow Question on a new build

[johngil]

I began the construction of what I am currently referring to as "the beast". I am building a smoker/grill out of a 325 Gal propane tank. I am thinking of using 6" pipe as the air intake as well as the vent.
I will put a damper on both BUT the question I have is this: Is 6" pipe too big for both? and is it OK to use galvanized on the vent? How long should the vent be? I was going for 3'
The tank is 32" dia. and about 7 1/2 ft long.

Pics at:
http://i294.photobucket.com/albums/m...6/dsc00447.jpg
http://i294.photobucket.com/albums/m...6/dsc00452.jpg
http://i294.photobucket.com/albums/m...6/dsc00454.jpg
http://i294.photobucket.com/albums/m...6/dsc00458.jpg

 

[bb53chevpro]

IMO, if you have a damper in both, 6 inch should be fine because you can control the air intake by closing it. As fas as the galvanized, if it is going to get hot over 100 deg f. I would not use it unless it is for the exhaust. You want any nasties getting into the food.
This is my opinion.
Hope this helps.
Andy.