Food processor with an air balancing system

A system for blast freezing of food products comprising, a freezing chamber, food product entry and exit ports in said freezing chamber, food product conveying means extending through said entry port said freezing chamber and said exit port for conveying food products into through and out of said freezing chamber, means mounted in said freezing chamber for circulating refrigerated air over the food product as it is conveyed through said freezing chamber to freeze said food products, air balancing means coupled to at least one of said food entry or exit ports, said air balancing means including shroud means, means for coupling said shroud means to at least one of the food product entry or exit ports, said shroud means surrounding said conveyor means and extending at least partially into the flow path of said circulating refrigerated air in said freezing chamber, said shroud means positioned to intercept a determined part of the flow of refrigerated air inside the freezing chamber to produce an air flow condition in which there is a substantially reduced net flow of air into said freezing chamber and substantially reduced net flow of refrigerated air out of said freezing chamber.