[Clayart] Kiln Stacking

Vince Pitelka vpitelka at dtccom.net
Thu Jul 14 15:31:55 EDT 2016

Hi Bill - 
I have always found the same arrangement to work best on downdrafts - to have the first shelf at the height of the top of the flue opening.
- Vince

Vince Pitelka
Appalachian Center for Craft
Tennessee Tech University
vpitelka at dtccom.net   

-----Original Message-----
From: Clayart [mailto:clayart-bounces at lists.clayartworld.com] On Behalf Of William Schran via Clayart
Sent: Wednesday, July 13, 2016 9:14 PM
To: Clayart international pottery discussion forum <clayart at lists.clayartworld.com>
Cc: William Schran <wschran at cox.net>
Subject: Re: [Clayart] Kiln Stacking


We had a 24 cu ft Geil downdraft, 6 burners, straight up from underneath the kiln.
The manufacturer specified the first shelves set on the kiln floor.
Found the best way to get even firing was to make sure the first shelves up on posts were as high or higher than the height of the flue opening.
The rest of the stacking did not seem to matter as much as that one constant.


Bill Schran
wschran at cox.net

On 7/13/16, 1:29 PM, "Clayart on behalf of Randall Moody via Clayart"
<clayart-bounces at lists.clayartworld.com on behalf of clayart at lists.clayartworld.com> wrote:

>I have been wondering about the most efficient stacking scenario for a 
>downdraft kiln. I have always stacked shorter items to the bottom and 
>taller to the top with a staggering of shelves as much as possible. 
>This leaves much more room up top where the heat naturally rises to 
>than the bottom. Has anyone tried inverting the stack i.e. tall on 
>bottom and short up top?
>Also, I have been firing this kiln for a while (about 30-40 firings)and 
>in the same way but for some reason the results are not the same. I am 
>now having to fight to keep the kiln evenly heated and get good 
>reduction even though I am doing the exact same things at the same 
>times. I either get even heat with poor reduction or good reduction 
>with a cone or two difference between top and bottom.
>(Firing an ~36 cu ft downdraft with 6 venturi burners pointing up along 
>Randall in Atlanta
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