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I built a kiln vent. For ease of construction I am using the bottom peep hole for exhaust instead of drilling holes in the bottom of the kiln. I think the peep hole was to big on its own. I took a hollow peep plug and drilled four holes through the end tip. The kiln vents through these. The end of the vent, 6" expandable aluminum, fits snugly against the side of the kiln. It is held in place with wire from the two plugs above it. This all works great. No odor at all during firing. Prior to the using the vent my kiln always fired one cone hotter on the top shelf than the bottom. I was thinking the vent would help even out this difference. It hasn't. After two bisque firings, the top shelf is still one cone hotter than the bottom. I am glaze firing today. I have several glazes that are cone 5 only. They will blister at cone 6. So I make sure this glaze is in the bottom shelf only. I put my more flexible glazes in the middle and top. Question: Could this temp difference simple be an element issue? I have never had to change my elements. At this time I am OK with the temp difference due to the different glaze temps. But in the future what can I do the get more even temps. I want to try some controlled cooling firings. I am worried how these will turn out. I appreciate any help offered.