A drying system for a dishwasher including a passive vent assembly mounted to a top portion of the dishwasher. The passive vent assembly includes a passive vent structure having a series of air vents defined therein and through which drying air flows are drawn into the wash chamber of the dishwasher, a diffuser mounted over the air vents and including a series of fins for spreading the drying air flows across the wash chamber, and a moisture trap hood mounted over an upper surface of the passive vent structure.