Mechanism: Uses a heating element, fan, and vents to circulate warm air, preventing case hardening where food dries only on the outside.Stackable (Tray) Dehydrators: Generally made of plastic, these are vertical flow units that are compact but may require manual tray rotation.Cabinet (Shelf) Dehydrators: Usually made of stainless steel, these provide horizontal airflow for more even drying, often with more capacity.Controls: Essential features include adjustable thermostats (\(95^{\circ }F\) to \(165^{\circ }F\)) and timers to handle different food types.