My burner uses a 1-1/4" pipe and my vent hole on the top is 2" and the drain
vent is 1" and the leak around the lid, well, it's there! The furnace is for a
#10 crucible (6" dia, 8" high). If you make your hole too small you may have
trouble opening it up. If you make it too big, you can make a 1" thick 'washer'
with a smaller hole to lay over the lid vent to choke it down. I think you will
be all right with a 2" vent.
William Schmiedlin wrote:
> Ok guys, I don't want to loose sleep over this, but there has to be some
> formula or rule of thumb over the size of the vent hole.
> If the furnace is empty, I figure about 1500 in^3 of volume. And being that
> there is a monster burner in there (1.25in) Do you think a 2" vent hole is
> too big or too small?
> Thanks for the other advice.
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