You'd think something so simple would not cause a problem, but...
I have a stainless steel smoker. It came with a metal stand and 2 metho burners that sit in holes in the stand underneath it. I have been experimenting with it, and I am getting good results, however, the flame from the metho burners always seems to spread and burn across the whole width and length of the stand, and not just stay, as I expected, as a ring of flame from the holes in the burners. I thought I must be overfilling them, but even putting a small amount of metho in them results in the same problem. I even went and bought 2 of the cheap metho burners that BCF sells. These are better, but still the same thing happens.
It happens after about 5 minutes, after everything reaches peak temperature. It's almost as if the gas from the metho burners ends up filling the space in the stand, under the smoker, and so there is flame everywhere (it is a yellow, sooty flame). Could it be lack of ventilation in the stand? The stand is a 4 sided pressed metal affair, with some slots and gaps, but maybe not enough??