Patent ID: 7901517

Claim:
A conveyor dishwasher having at least one washing zone, at least one rinsing zone, a heat-recovery device, a drying zone and a suction-extraction means, the dishwasher further comprising: an exhaust-air fan employed in the suction-extraction means for exhausting air from a plurality of the zones through the heat-recovery device; a plurality of openings provided between the zones and the suction-extraction means for conducting flows of air from the zones to the suction-extraction means; a closing element provided at each opening for controlling the flow of air through the opening, each of the closing elements being movable between an open position, a wholly closed position and a partially closed position; wherein a capacity of the exhaust-air fan, and thus an exhaust-air quantity withdrawn through the heat-recovery device is controlled in dependence on the operating state or states; and wherein the movement of the closing elements between the open, wholly closed and partially closed positions is controlled in dependence on an operating state of individual ones of the zones of the dishwasher.