Dehydrator Air Flow: Horizontal or Vertical?

By Eric Mitchell •  Updated: Nov 14, 2022 •  5 min read

Food Dehydrator Air Flow Explained

Food dehydrators for home use are generally available in two main types, stackable tray dehydrators with vertical airflow that are generally cylindrical in shape – such as the Presto 06301, and cabinet-type horizontal airflow dehydrators containing removable rectangular or square shelves – such as the Excalibur range of dehydrators.

Dehydrator Air Flow - Horizontal or Vertical

Some stackable vertical airflow dehydrators are available with rectangular or square-shaped trays, such as the Hamilton Beach 32100A, but these are less common than those with round trays. Almost all horizontal air flow food dehydrators, such as TSM and Tribest Sedona dehydrators, are cabinet or box-shaped.

What’s The Difference?


Most stackable vertical air flow food dehydrators are generally more compact and easier to move around and store away. They are more popular with people with less kitchen counter space, or those who do not do large quantities of food dehydration. Examples of stackable vertical airflow food dehydrator brands are Nesco / American Harvest, NutriChef, Waring and Ronco.

Horizontal airflow cabinet type food dehydrators, especially stainless steel ones, are often larger and heavier than their stackable counterparts, and are usually used by people who do large amounts of food dehydration.

They can take up a lot of counter space and are not very portable or easy to store in kitchen cupboards. For example, the all-stainless steel commercial STX Dehydra 1200W-XLS horizontal airflow cabinet dehydrator has an impressive 16 sq. ft. drying area and, being all stainless steel, weighs in at 32 lbs. Smaller cabinet-type horizontal airflow food dehydrator brands include Aroma and Magic Mill.

Dehydrator airflow

Most stackable vertical air flow food dehydrators, however, can be expanded be adding extra stackable trays to increase their total drying area. The Nesco Gardenmaster FD-1040 can, according to the manufacturer, be expanded from 4 trays to 20 trays, increasing its drying area to a total of 20sq. ft. User reviews, however, indicate that the optimum number of trays is between six and twelve, after which its performance drops noticeably.

How Do They Work?

Vertical Air Flow

Although stackable vertical air flow food dehydrators vary from one another in some respects, both are great dehydrators for making jerky, but the main feature is that the air is heated and fan-fed either in an upward or a downward direction through the stacked trays, depending on whether the fan-heater unit is in the base or the lid of the dehydrator. Some makes, such as Nesco American Harvest, claim to have a horizontal airflow system (Converge-Flow®) in a stackable dehydrator, whereby the heated air is forced down channels along the outside of the trays and then horizontally across the surface of the trays and into the hollow central column.

Cabinet shaped horizontal air flow food dehydrators generally have the fan heater unit located in the rear panel of the unit, with the fan drawing air in from behind the cabinet and blowing the heated air horizontally across the tray surfaces from the back of the cabinet to the front. These usually have one fan with long blades, but some have two fans, one above the other, aimed at achieving a better spread of airflow.

Pros & Cons

Vertical Air Flow Food Dehydrators

  • Are mostly stackable in form, taking up little counter space
  • Can, in some cases, be packed with trays upside down to reduce the vertical height for easier storage
  • Can be found in a variety of shapes, circular, oblong, square, rectangular
  • Can generally be expanded by the addition of trays to increase the drying area
  • Usually, cost less than vertical airflow models of similar capacity (e.g. Presto 06301 v Magic Mill Pro)
  • They tend to dry food on the lower trays faster than on the upper trays
  • This requires trays to be swapped during the process, releasing heat and interrupting the airflow
  • Vertical airflow can lead to mixing of flavors as air passes from one level of food to another
  • Base-mounted fan-heater units are vulnerable to ingress by food particles and juices
  • Stackable food dehydrators are only available in plastic, which is a health concern for some people

Horizontal Air Flow Food Dehydrators

  • Are usually box-shaped cabinets in form (except some Nesco Converga-Flow® models)
  • Are less vulnerable to problems caused by food particles entering the fan – heater unit
  • Generally provide greater drying space
  • Are easier to load food onto because their trays are either square or rectangular
  • Allow more flexibility in terms of vertical space between trays (trays can be omitted)
  • Can have food-grade stainless steel trays
  • Can be made entirely of food-grade stainless steel
  • Usually, don’t require swapping of trays to produce even drying times between trays
  • Are less likely to mix flavours
  • Tend to take up more counter space than vertical airflow models
  • Are not expandable by addition of trays


As you can see, vertical airflow and horizontal air flow food dehydrators both have good and bad points. Each type will suit different people with differing requirements and is hard to say which is the best dehydrator for the money.

It might be a case of moving from one type to another as your circumstances change, and you may want to buy a small stackable dehydrator that you can add to as you get into the swing of drying food. If you can afford it, however, a good horizontal airflow food dehydrator is a great investment.

Eric Mitchell

Eric is the owner, author, content director and founder of He is the lead architect and the main man in matters concerning dehydrators, their accessories, guides, reviews and all the accompaniments.Whenever he is not figuring out simple solutions (hacks) involving cookery and their eventual storage, you will find him testing out the different types of dehydrators, to bring us the juicy details regarding these devices.He is a foodie enthusiast, pasionate about making jerky has a knack for healthy and tasty food and won't hesitate to share out any ideas that might be of value around this subject.

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