As it stands i have a 120 gallon propane tank that i am using. I am on duty today so i can't measure the tank myself, however, from what googling told me it's roughly 55" long and 30" in diameter. I have looked at the calculator and did the numbers from what yall have posted. My questions are this; how do you determine how deep into the chamber the exhaust stack should be? If it was shorter and flush to the top of the chamber, but had a damper to control flow i would think that the length wouldn't matter at that point. Also, the height of the grate in relation to the rf plate... is it an educated guess? Or is there more science to it than that?
Thanks for any input,