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The downdraft kiln vents are fantastic. They create a slight negative
pressure inside the kiln preventing the escape of any fumes. Other than the
slight warmth near the kiln, one cannot tell the kiln is firing! I wouldn't
use any other type to vent my kiln. The other advantage is that they even out
the heat distribution inside the kiln. Instead of the heat maximizing near
the top, it is sucked down towards the bottom. Much like a ceililng fan in a
high peaked room. Good luck.