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Combine efficient box storage and expert ventilation to maintain produce quality and minimise weight loss during storage.
Why a letterbox system?
In a letterbox system the pallet openings of the boxes are used as air ducts. In the pressure wall, each pallet opening can be covered with a flap. As a result, you can control per row and per layer whether air flows through the duct. Therefore, the letterbox system is highly flexible in use, making it suitable when there is plenty of diversity in your product. The letterbox system is frequently called a “drying wall”, and that is for a reason! The system has excellent drying performance. Keep in mind that the system is mainly suitable for smaller batches, because row lengths are limited to 8 to 10 boxes.
How does it work?
The fans force air down, causing an overpressure in the wall and in the pallet openings of the boxes. This overpressure forces the air through the bottom of the box, and through the product. Any air treatment, such as heating, occurs in the pressure wall. Inlet hatches are positioned in the pressure wall, above the fans. The position of the outlet hatches is flexible.
A letterbox system is most commonly used for the following products:
• Onion (sets)
• Seed potatoes
• Garlic