Crisper drawers have a different level of humidity from the rest of the refrigerator, optimizing freshness in fruits and vegetables.
[1] Crisper drawers operate by creating an environment of greater humidity than the rest of the refrigerator.
When the vent is in the open position, airflow keeps humidity in the crisper drawer low, which is beneficial for the storage of fruits.
The ability to separate low-humidity fruits from high-humidity vegetables using the different crisper drawers also prevents ethylene gas from damaging the latter.
[2] Appliance manufacturers have reported that many refrigerator owners are unaware of the purpose or operation of crisper drawers.