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Product stacking is another important factor in protecting the
product. Products that generate heat -- fruits and vegetables, for
example -- should be stacked so the air can flow through the product
to remove the heat. This is called “air stacking” the product.
Products that do not create heat -- meats and frozen products --
should be stacked tightly in the center of the trailer. All products
should be kept away from the side-walls of the body, to allow air flow
between the body and the load; this prevents heat filtering through
the walls from affecting the product.
It is important to check the temperature of the product being loaded
to ensure that it is at the correct temperature for transport. The
refrigeration unit is designed to maintain the temperature of the
product at the temperature at which it was loaded. It was not
designed to cool warm product.