Figure 12: Illustration of the interior of the fireboxes and the bag walls from inside the kiln.
The Damper. The Dampers on the chimney ride in slots made from reinforced concrete. The
damper itself must be made from very heavy gauge plate steel (over O.8cm) to avoid
warping in the high temperature flue gases. A handle should be provided on the end of
the damper plate to assist in adjustments.
Above Arch Packinq. Above the brick ceiling arch of the kiln you may put a packing. This is
done by building a rim wall about the perimeter of the kiln, and filling over the arch. In
Sri Lanka this area is generally filled with sand, but experiments with ash, or other
effective insulators may lead to further fuel savings.
For details on operation of the kiln, please refer to Chapter 4.