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Added the intake riser to this model, don't really care for the difference it make's in the temp. flucuation, not as steady temp's and not as efficient burn's...IMO i like the bend over model
Hmmm..a possible problem/fix for the riser model. At least DOUBLE the pipe size. Airflow restriction is a function not only of the pipe size, but the pipe length. Maybe even triple... with those 2 90's in there...
On Edit: Once you are a few inches away from the 90 off the base, you could change to Sched. 80 PVC for weights and cost reduction. Use a plastic valve even.