For centuries food has been dried in the sun or open air - a lengthy, messy and difficult process inviting contamination and spoilage. With the introduction of electric dehydrators the drying process was improved. But most manufacturers offered round stackable models with a heating unit in the bottom. Round Stackable Units Heating unit in bottom. Hard to clean.
Spills fall directly on electric components.
Vertical drying requires tray rotation as trays closest to heat source dry first. Units without fan or thermostat may spoil food or not dry at all. Round design cuts off corners and has holes in center, reducing usable drying area. Non-adjustable stackable design restricts size of drying chamber. Excalibur Parallexx System Complete drying system in rear.