A drier which has a reversible power operated air mover for circulating air through multiple loads in either of opposite directions. An exhaust duct means is provided for removing moisture-laden air in a region between the loads, and a dilution air means is provided for introducing dilution air into this region. Means is provided for heating the dilution air introduced. The means for introducing air and with drawing air and for heating the air have the same operating characteristics irrespective of the direction of air movement.
