Abstract: A device for regulating and cleaning an air port (3) arranged in the wall (2) of a furnace, especially a soda house furnace, comprises a cleaning arrangement (1) and an arrangement (4) for regulating the air flow through the air port, in which an air casing (5) is arranged around the air port on the outer side of the furnace wall, in which a drum (12) is arranged inside the air casing and air-tightly connected to the wall of the air casing located opposite to the furnace wall. An opening defined by at least a cover member (14) of the regulating arrangement and at least one lateral wall of the drum is arranged with a restricted extension in the circumferential direction of the drum so as to achieve an air jet in towards and through the air port (3).

Abstract: An apparatus for regulating and cleaning air passages (4) provided in the side-wall of a furnace, such as a soda recovery boiler, and connected to an air box positioned outside the wall, comprising a sleeve member reciprocatably mounted in the air box and insertable into the air passage. The rear opening of the sleeve member connects to and is supported by a hollow section of an elongate holder which is slidably mounted in the longitudinal direction thereof and extends through the wall of the air box, and which holder is operatively connected to a driving device. The hollow section of the holder comprises at least one air inlet.