How Does it work?

after harvesting the wet trimmed or bucked cannabis is placed in cannabis trays (Canna-Trays) by an operator. He/she puts every full canna-tray in a “Sandwich Unit“.

What is a Sandwich Unit? 

A Sandwich Unit is consist of filters and trays:

a. First, at the bottom is a layer of a HEPA H13 Filters and a Filter Pad. 

b. Second, two piles of cannabis trays are placed on the filter.

c. On top a final layer of HEPA H13 Filters and a filter pad is placed.

A Sandwich Unit is build in all of our products:

When the drying system is filled with cannabis, the operator activates the automated drying process (ABC processor) on a device, like a
tablet/mobile phone / a LED-monitor in the drying room itself, or computer in the office. The whole 
drying process can be controlled from anywhere on the world in a safe VPN connection. 

With this cannabis drying method every single bud gets a – constant – controlled – top-down – evenly spread – 100% clean flow of process air – immediately after the bud is put in the cannabis tray and the tray is placed in the sandwich unit.





A Canna-Tray is where the cannabis is placed after harvest. Each Canna-Tray theherbcentre is divided into six low compartments (see image) preventing the cannabis from moving around and to make sure all the cannabis is evenly dried.

A Canna-Tray is made of an anti-static ABS  thermoplastic compound. The anti-static compound prevents the plant material from sticking to the tray.

Each Canna-Tray has 1944 round holes of 6 mm (0.24-inch diameter) in the bottom. The holes ensure a continuous and equal top-down flow of controlled and cleaned process air throughout the duration of the drying (& curing) process.

tray for clean cannabis drying

Cannabis Tray “Canna-Tray”


With the TOP-DOWN SANDWICH DRYING METHOD, every single bud gets a constant – controlled – top-down – flow of process air. The process air is evenly spread between all buds. This is done with Canna-Trays and filters. Get more information about the best online casinos for real money. These are stacked on top of each other as a sandwich.
The filters make sure that the cannabis remains in a clean environment.

Graphical view of one Sandwich-unit.
(By definition a sandwich unit is a closed clean and tight box. To explain the system we show it open here)

HEPA FILTER (filterclass H13)

To get the best clean air conditions — eliminating all risks: viruses, pests etc.  uses two types of filters: a HEPA (nano) filter and a filter pad.

The High Efficiency Particulate Air (HEPA) filter is made of micro-glass fiber sheet, meeting the highest European and U.S. standards. HEPA filters are used for specific clean cells in hospitals, pharmaceutical, nuclear and micro-electronics industry.





A Pallet-sandwich is built on the Ventilation Pallet. A Pallet-sandwich consists of 4 sandwich units, placed on a Ventilation Pallet. The Ventilation Pallet ensures easy, safe & efficient transport with a forklift.  

Properties of the Ventilation Pallet:

  • Made of Stainless steel.
  • Front has 2 openings for easy & efficient transport by a forklift.
  • The back has big openings for process air to leave the pallet sandwich.
  • Designed in such way, that the air is evenly distributed over the 4 sandwich units.



Cannabis drying Pallet

Ventilation Pallet is the holder of 4 Sandwich Units
when working with drying cells


For you, being the manager, on this page the magic actually begins and ends. We are proud of our processor controller:  the ‘ABC’ HVAC -system for Cannabis. Our Cannabis HVAC controller is build and maintained in-house.

The ABC system consists of a CPU / processor and a software program. It is suitable for Windows, Unix and Apple systems. It is a stable, state-of-the-art system; holding over 35 years of stable and proven innovations.

It is implemented on thousands of control systems – in various agricultural sectors worldwide -, in all 6 continents – over 50 countries. With our world-class technology, we can guarantee that you can set optimal drying conditions for your own cannabis business processes and gain substantial benefits. 

How is the ABC -HVAC Controller used?

Our ABC processor and software enable easy management of the drying and curing process every step of the way.




Example of an ABC Controller page



Most facilities still dry their cannabis by hanging the whole plants or stems of the plants upside down in a conditioned room. With our Top-down drying method, wet trimmed or bucked cannabis flowers are placed in Canna-Trays. 

After a study that compared the Top-down drying method with hang drying, no differences in terpenen and cannabinoid content could be found. Whilst the Top-Down drying method is 90% more space-efficient,