Here's my Intermittent firing log from the last firing, as the kiln is getting closer to temp I do an ox/red each hour then clean up at the end of the firing with ox. All controlled by the simple sliding damper mechanism at the flue base.. 1 inch - 2 inch on each side.
The reduction starts at 1000deg. or 900 if I'm doing a copper red firing.
Watching for smoke at the flue and flame at the bung..depending on whether I want a heavy or light reduction for this firing I wanted some carbon trapping so smoke was a good thing!
So 6pm I open up the dampers fully for 15mins, then push back in 1-1 1/2 inch for 45min, and repeat till cone 10 down which was 9.30pm
I introduced some red gum chunks at cone 9 into the bung hole each hour til finish. and that's it close everything off and block up all air intakes...