There is illustrated a fuel fired brazier (20) for an enclosed granular fuel burning boiler. The brazier (20) has an apertured grate-like brazier base. The brazier base is moved by an actuator (16) from an operative position, retaining fuel in the brazier (20) to a discharge position where ash can fall through the hole (35). At the same time, fragmentation means (37), formed by crushing teeth (38), move across the brazier (20) to trap, for example, as shown, a large piece of clinker (A) between it and the opposed distal wall (23) of the brazier (20).