Um das Temperieren von mit Kisten (21) z. B. voller Fleisch beladenen Paletten (20) in einem Temperiertunnel (1) zu beschleunigen, können sich dessen Wände (6) an die Außenseite der gestapelten Kisten (21) anlegen, was durch den beim Hindurchsaugen von Umgebungsluft auftretenden Unterdruck automatisch mitbewirkt wird.The tempering tunnel (1) for boxes that are filled with pieces of meat and stacked on pallets, comprises a front-open housing, a blower (3) to transport an ambient air through an inner space (4) of the housing in a longitudinal direction of the tempering tunnel, and openings present in the front- and rear walls of the stacked boxes standing transverse to the longitudinal direction of the tempering tunnel, where the blower is a suction-blower at a rear closed end of the inner space and the walls of the tempering tunnel are movable in a transverse direction. The tempering tunnel (1) for boxes that are filled with pieces of meat and stacked on pallets, comprises a front-open housing, a blower (3) to transport an ambient air through an inner space (4) of the housing in a longitudinal direction of the tempering tunnel, and openings present in the front- and rear walls of the stacked boxes standing transverse to the longitudinal direction of the tempering tunnel, where the blower is a suction-blower at a rear closed end of the inner space and the walls of the tempering tunnel are movable in a transverse direction, so that they design at the outer surfaces of the stacked boxes. The blower is dimensioned, so that a low pressure develops in a blower box (8) during filling the tempering tunnel and/or a roof (7) is moved in a height, so that it forms at an upper side of the stacked boxes. The blower is arranged onto an upper side of the blower box. The blower box is present at the rear end of the inner space, extends over the entire height of the stacked boxes and the entire width of the stacks, and passes down maximally to a lower edge of the lowest box. The wall
