A drier comprising a drier chamber inside a drier housing. An inner atmosphere of the drier chamber has an elevated temperature relative to the outer atmosphere. An inlet lock and an outlet lock reduce the inflow of the outer atmosphere into the drier chamber and the outflow of the inner atmosphere into the outer atmosphere. The inlet lock comprises a first air curtain, which extends over the inlet lock and which runs upward, and a second air curtain, which is behind the first air curtain in the direction of motion of the objects and which extends over the inlet lock and which runs downward. The outlet lock is designed substantially identically to the inlet lock, however the objects first pass through an air curtain directed downward and then pass through an air curtain directed upward. The conveyor system is designed that the objects are moved continuously and at a substantially constant height through the entire drier housing.