[Stoves] Premix configuration

[alex english]

Paul,
See below for a link to a picture.
The gasses rise through a 2 inch diameter pipe which draws from a 12 inch
diameter fuel chamber. Secondary air is introduced tangentially below the
smooth funnel which expands to  6 inches. The picture shows that the high
heat from the flame affects only the top of the funnel. So there is an 8
inch + distance where premixing occurred and velocity exceeds the flame
speed.

https://goo.gl/photos/GB9PMaf6dX3n8cQ78

Alex
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