ChefLine FLAME 4 Manuel D'instructions Et D'utilisation page 89

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Please note: In the FLAME 4 and FLAME 6 pizza oven models, the superimposition of the two ovens means that the
lower oven is equipped with an inclined vertical tube (at 45°) in order to be able to discharge the smoke away from the
discharge outlet of the upper oven, thereby avoiding disturbing the correct forced draught.