# Horizontal vs vertical airflow dehydrators

Source: https://freezeandseal.com/blog/horizontal-vs-vertical-airflow-dehydrator
Published: 2026-10-09
Publisher: Freeze & Seal

**Short answer:** Horizontal airflow dehydrators are boxes with a rear fan that blows warm air across every tray at once, so trays dry at similar rates and you can remove trays for tall items. Vertical airflow dehydrators are stackable round units with a fan in the base or top that pushes air up or down through the stack; they are often cheaper and expandable, but trays farthest from the fan can dry slower and flavors pass through the stack. Pick horizontal for jerky, mixed loads and big batches; vertical for budget and expandability.

This page is for anyone choosing between a box-style dehydrator and a stackable round one. We explain how air moves in each design, what that means for even drying, tray rotation, flavor mixing, capacity and price, and how to get even results from either. Our examples are two horizontal units, the Excalibur Performance Series 10-tray and the Cosori 10-tray, and one vertical unit, the NESCO FD-1018A Gardenmaster Pro. All specs come from their Amazon listings.

## How air moves in each design

In a **horizontal airflow** dehydrator, the fan and heater sit at the back of a box. Warm air blows forward across each tray side by side, so every shelf gets air at roughly the same temperature at the same time. The Excalibur listing calls this Horizontal Parallex Air Flow, the Cosori listing describes a rear fan, and the LEM BigBite 16-tray in our catalog lists dual rear-mounted fans with rear venting.

In a **vertical airflow** dehydrator, round trays stack on a base, and the fan and heater sit in the base or the lid. Air travels up or down through the stack, passing over one tray before reaching the next. Classic stackable units often need trays swapped partway through so the ones farthest from the fan catch up. Some makers address this with ducted designs: the NESCO FD-1018A listing describes a top-mounted fan with a Converga-Flow system that it says dries evenly without tray rotation.

## Three dehydrators side by side

| Spec | Excalibur Performance 10-Tray | Cosori 10-Tray | NESCO FD-1018A |
| --- | --- | --- | --- |
| Airflow | Horizontal (rear) | Horizontal (rear fan) | Vertical (top-mounted fan) |
| Trays | 10 stainless steel | 10 stainless steel, 15.6 x 15 in each | 8 BPA-free, expandable to 30 |
| Drying space | 16 sq ft | 16.2 sq ft | Not stated in the listing |
| Temperature range | 85 to 165 F | 95 to 165 F | 95 to 160 F |
| Timer | Up to 80 hours | 48 hours, 30 minute steps | Not stated in the listing |
| Power | Not stated in the listing | Not stated in the listing | 1000 W |
| Rotation needed | Listing says no | Listing claims even drying | Listing says no |
| Listed price at writing | $379.99 | $269.99 | $176.99 |

Listing facts for two horizontal units and one vertical unit

## Evenness and tray rotation

Because every tray in a box unit gets air straight from the rear fan, horizontal designs are generally the more even of the two. Food near the back of each tray can still dry a little faster than food at the front, so turning trays front to back once during a long run is a cheap habit that helps any box unit.

Vertical units vary more by model. A basic stackable dehydrator with the fan in the base can leave top trays wetter than bottom ones. Better designs such as the NESCO with its top fan and ducted airflow aim to reduce this. With any stackable unit, check pieces from the top, middle and bottom trays before you call a batch done. Our [dehydrator drying unevenly](https://freezeandseal.com/blog/dehydrator-drying-unevenly) page lists the causes and fixes for both types.

## Flavor mixing, capacity and tall items

**Flavor mixing.** Strong smells such as onions, garlic and jerky marinades travel with the air. In a vertical unit the air passes from tray to tray, so drying onions under apples is a reliable way to get onion-flavored apples. A box unit shares air within one cabinet too, but because air crosses each tray separately before exhausting, mixing tends to be less pronounced. In either type, dry strong foods in their own batch.

**Capacity.** Box units have a fixed number of trays. The Excalibur and Cosori both list 10 trays and about 16 sq ft. Stackable units can grow: the NESCO listing says it expands from 8 to 30 trays, though more trays means more distance from the fan.

**Tall items.** In a box you can slide out trays to make room for jars of yogurt, bread proofing or thick items. Stackable trays sit at a fixed spacing unless you buy extra rings or spacers.

## Price, materials and safety

Stackable round dehydrators are usually the cheaper way in; the NESCO is listed at $176.99 against $269.99 and $379.99 for the two box units. Box units in our catalog commonly come with stainless steel trays, while many stackable units use BPA-free plastic trays, as the NESCO does.

For jerky, temperature matters more than airflow direction. USDA advises heating meat to 160 F and poultry to 165 F before drying, then drying at a steady temperature. All three units list a maximum of 160 to 165 F. See [how to make jerky in a dehydrator](https://freezeandseal.com/blog/how-to-make-jerky-in-a-dehydrator) and the [dehydrator temperature chart](https://freezeandseal.com/blog/food-dehydrator-temperature-chart).

Note: Home dried jerky keeps about 1 to 2 months at room temperature according to USDA FSIS. Most home dried fruits keep about 1 year at 60 F per NCHFP. Store dried foods airtight, cool and dark.

[See the best dehydrators for jerky](https://freezeandseal.com/best/best-dehydrator-for-jerky)

## Which design to buy

For the wider field, see [the best food dehydrators](https://freezeandseal.com/best/best-food-dehydrator) and [the best Excalibur dehydrators](https://freezeandseal.com/best/best-excalibur-dehydrator). Still weighing other machines? Read [food dehydrator vs air fryer](https://freezeandseal.com/blog/food-dehydrator-vs-air-fryer) or [freeze dryer vs dehydrator](https://freezeandseal.com/blog/freeze-dryer-vs-dehydrator).

- Buy **horizontal** if you dry jerky often, run mixed loads, want stainless trays, or need room for tall items.
- Buy **vertical** if you want the lowest price, expandable capacity, or a lighter unit you can store away.
- Buy a large **horizontal** unit for big batches; see [the best commercial dehydrators](https://freezeandseal.com/best/best-commercial-dehydrator).

## Frequently asked questions

**Do I need to rotate trays in a horizontal dehydrator?** Usually not between shelves, and the Excalibur listing says no rotation is needed. Turning trays front to back once on long runs can still help.

**Why is the top tray of my stackable dehydrator still wet?** It is farthest from a base-mounted fan, or the stack is too tall. Swap trays partway through or dry fewer trays at once.

**Can I dry onions and fruit together?** It is best not to in either type, and especially not in a stackable unit where air passes through every tray.

**Why is my dried fruit still sticky?** It usually needs more time or thinner slices. See [dehydrated fruit still sticky](https://freezeandseal.com/blog/dehydrated-fruit-still-sticky).

## Gear guides for this topic

- https://freezeandseal.com/best/best-food-dehydrator
- https://freezeandseal.com/best/best-dehydrator-for-jerky
- https://freezeandseal.com/best/best-excalibur-dehydrator
- https://freezeandseal.com/best/best-commercial-dehydrator

## Sources

- [National Center for Home Food Preservation](https://nchfp.uga.edu/)
- [USDA FSIS](https://www.fsis.usda.gov/)