Hi, I have a 10 sided L&L kiln (second hand) and got an Envirovent 2. I just finished installation according to directions (3 small holes in the bottom, 3 holes evenly spaced on the top) over the weekend and when testing the top holes are not drawing flame in. I turned on the fan and tested the holes in the bottom, they draw flame perfectly fine, but the top, the flame do not draw in. Any suggestions? My kiln is in a utility room under the house so I would like to get this working so I can divert fumes when I fire.