Crossdraft salt glaze

[Mirrored-K-Studio]

Does having a bagwall effect how the chimney damper works?

[Mark C.]

Any bag wall will affect flow so yes it will or can-if the wall is to high it slows down draw to short to much flow-its a relationship

The dampener also affects flow as does the the height of chimney (draw is more with taller stack for example)

[neilestrick]

In a downdraft/crossdraft, the bagwall keeps the flame/heat from traveling directly across the bottom of the kiln from the burners/firebox to the flue opening. It forces the heat/flame to go upward before being pulled down and out the flue. If the bottom of the kiln tends to run hot, raise the bagwall a bit. If the top runs hot, lower the bagwall a bit. Half a brick will often make a noticeable difference. In a wood burning crossdraft kiln the bagwall is typically taller than in a gas kiln, and checkerboard- with openings between each brick to allow for ash and flame to move through a bit. In a gas kiln it's shorter, maybe only 9-13" high. It doesn't usually take much in a gas kiln to have a big effect. 

[C.Banks]

I'm wondering too now

does the bag wall affect the flow or just the path?

if the primary and secondary air remains unchanged then the answer could be no - the damper operates the same with our without bagwall. the bagwall does not change the supply of fuel or air.

once the draw of a kiln is established the flow rate of gases should stay the same regardless of the path

good question though gets a person thinking

 

[neilestrick]

The bag wall will change how the kiln responds to changes in the damper, but I don't think it will affect the amount of air flow.