An air nozzle (3) mounted in the wall of a recovery boiler for supplying air from a supply duct (4) into the recovery boiler. The air nozzle (3) comprises a nozzle duct (7) attached to the wall of the recovery boiler and a separate nozzle part (3a) insertable into the nozzle duct in its longitudinal direction, air being supplied into the recovery boiler through a duct provided in the nozzle part (3a).
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