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The use of above-ground metal ventilation ducts is an affordable and very effective way of ventilating produce if is set up correctly.
The major advantage of this system is that the ducts can be removed and stored (needing little space), leaving the floor of the warehouse free for other purposes, like storing heavy equipment when there is no produce.
Bulk storage onions with above ground removable metal ventilation ducts, the Netherlands
Bulk storage potatoes with above ground removable metal ventilation ducts, Denmark.
Removable metal ventilation ducts, Mexico
Here the diminishing diameter can be noticed, which is paramount for a good equal pressure distribution, otherwise homogeneous airflow through the product cannot be guaranteed.
These ducts are awaiting transport to their final destination. But this picture also shows one of the major advantages of this way of ventilating: The ducts, when not used can be stored like this in a corner of the warehouse and the complete floor of the warehouse is free and can sustain heavy loads, in contrast with a double or ducted floor.
Inside the removable ventilation duct for bulk storage
The inside of a pressure chamber.
The turbine with its no-return valve is shown at the top and the outflow of two metal ducts can been seen.
The pressure chamber plays an important role in equalising the pressure through the entire pile of produce.
Inside the pressure chamber of a bulk storage facility.
The use of above-ground metal ventilation ducts (if correctly laid out) is an affordable and very effective way of ventilating produce. The ventilation is very homogenous, and the major advantage of this system is that the ducts can be removed and stored (needing little space), leaving the floor of the warehouse totally free for other purposes, like storing heavy equipment when there is no produce.
To mechanise your post harvest processes:
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