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Solid cast concrete sheet at back of fire chamber
Allows combustion gases to escape into flue system
Prevents downdraughts pushing smoke back into room
100mm for proper upward draught
200mm
1:1:121:1:121:1:12
1500mm × 350mm reinforced
Prevents dampness penetrating chimney stack
100mm down
Directs water from back to sides of chimney
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