Flavel FKPC MN Series Installation, Maintenance & User Instructions page 26

3.2.3 Pick pebbles A to E and arrange along the the front rail, ensuring that
they are evenly spaced. Use the recess's in the front ceramic rail as a
guide for placement. (See figure 23 below).
Fig. 23
Pebble A
Pebble B
3.2.4 Select pebbles F to I and arrange behind the front row of pebbles,
ensuring that flame paths as indicated below are not interupted.
(See figure 24 below)
Fig. 24
Pebble F
Pebble G
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Pebble C
Pebble D
Pebble E
Pebble H
Pebble I