thanks all.........
my coke forge is all brick.no worries.
the is a ellis vt12 forge, as i am pretty pressed for time and didnt make one from scratch.
i just am concerned that the sq tubes will get damaged from the heat if i dont cover them
on the other hand if they were there it might not be a loss.........i dodnt have any propane experience so there will be a learning curve ( i hope:) )