Conditioned drying installation for cannabis

For ventilation pallets with trays, drawers and boxes


Directly after harvest, the cannabis stems can be hung up in boxes and put on the ventilation pallets (A). These ventilation pallets will be placed in a drying unit (B). A high-pressure fan (C) sucks the process air via a pallet from top to bottom through the boxes (J). The amount of air will be adjusted automatically per phase; lots of air when just harvested and less air when the product is already drier.

The moisture content of the air from each pallet will be measured. By doing this, the moisture content of the product can be determined. In this way, the cannabis will be dried individually in each pallet.

At the back side, the air will flow upwards (K) to the air of the drying unit. In the condensation dryer, the air will be dried by condensation and thereafter brought to the desired temperature (F); [65-70° F (18-21° C) and 50-55%].

At the frontside (G), this dried process air will be sucked into the boxes again and can absorb moisture from the cannabis.


The process air flows via the back side of the installation to the air dryer (K).

A part of the process air will be sucked through the condensation unit (D). There, the process air will be dried by letting the moisture (from the air (L)) condense.

The dried air blends with the rest of the process air (E). The blended process air (M) will be warmed up (F) at the front and flows via the front side (G) back to the ventilation pallets with boxes (A).

This warmed and dried air [65-70° F (18-21° C) and 50-55%] can absorb moisture again, from the cannabis (G).

The installation is suitable for drying cannabis stems with hanging in boxes. Because the process air is forced to flow through the cannabis, the boxes can be maximum filled. The amount of air and temperature can be adjusted to the different phases. Because of this, the drying process will run optimally. This will take place in the dark and separated per sort.

Stems with buds to approximately 50 cm, can be hanging to dry in the boxes.
Other lengths are possible as well.

Half a box in which stems up to 25 cm can be hanging to dry.

The ripening of the buds can take place in the same installation. The buds will be placed in low trays (H) or drawers. However, the cannabis buds can be dried loose in the drawers directly after harvest and thereafter be ripened. The ripening can take place directly after drying under the right air condition.

Drying and ripening of the cannabis buds in low trays (H) (6-8 trays stacked on each other),
which can be placed on the aeration pallet.

Above, the cannabis buds are getting dried in a box with 6 drawers. Placed in the same installation as the trays.

The internal transport is very efficient due to using aeration pallets and boxes. The cannabis can be hung in boxes or drawers directly at harvest or can be placed in boxes after trimming. Thereafter, these boxes are placed on the ventilation pallet. By using transport pallets, big amounts of cannabis stems and buds can be brought to the processing place or drying installation in a safe way and without any blending.

At the drying installation, the cannabis will go – without any extra actions – in and out the drying installation.


When used bigger volumes, or when curing cannabis, stems and buds can be dried by placing several pallets in front of each other in a bigger drying installation .
A powerful fan will suck the air per layer through 3 (or more) rows of pallets.
This air will be dried, warmed up and sucked through the cannabis again. Several pallets with cannabis can be dried equally by doing this.