The invention concerns an installation for the temperature treatment of products placed on pallets or similar, including at least one chamber, means for the introduction of a pallet, means for conveyance of the pallet between an entrance and an exit, and means for blowing air through the products on a pallet. It is characterized in that the installation also includes raisable, longitudinal separation means, placed substantially on the main axis of the said at least one chamber, which are used to prevent the passage of air between the top surface of each pallet present in the chamber and the ceiling of the said at least one chamber.
