Skutt Envirovent 2The EnviroVent 2 is what is known as a Downdraft Vent. Downdraft vents actively remove fumes from your kiln before they can enter the room and vent them outside keeping your studio free of smell. It works by using a wall mounted fan to draw a very small amount of air through holes drilled in the slab (floor). The amount of air drawn is determined by the number and size of the holes drilled. Holes are also drilled in the lid in a specific pattern