Abstract: Apparatus for processing meat products in a controlled environment, in which chambers are arranged in pairs, side by side with one another, and defined by outside walls, and a common median wall, with meat support means arranged on facing surfaces of the walls and having air ducts provided in the walls and openings provided over the extent of the inside surfaces of the walls whereby air may flow from side to side across the chambers and air supply ducts connected to distribution ducts in the walls, and a fan for forcing air therearound, and means whereby flow through the various ducts may be reversed at periodic intervals so that air flow will take place across the chambers in opposite directions, reversing at predetermined intervals during the treatment.

Abstract: An air flow reverser apparatus for use in association with an air flow system having air supply and return port means, said apparatus comprising a main supply duct, and a main return duct, said ducts being connectable to said respective supply and return port means of said air flow system, at least two branch supply ducts communicating with said main supply duct, at least two branch return ducts communicating with said main return duct, supply damper means for selectively shutting off at least one of said branch supply ducts, while leaving at least one said branch supply duct open, return damper means for selectively shutting off at least one of said branch return ducts while leaving at least one said branch return duct open, and means interconnecting said supply and return damper means whereby when a selected one of said branch supply ducts is closed, a selected one of said branch return ducts is open, and power operated means for moving the same from one position to another simultaneously.

Abstract: An air flow reverser apparatus for use in association with an air flow system having air supply and return port means, said apparatus comprising a main supply duct, and a main return duct, said ducts being connectable to said respective supply and return port means of said air flow system, at least two branch supply ducts communicating with said main supply duct, at least two branch return ducts communicating with said main return duct, supply damper means for selectively shutting off at least one of said branch supply ducts, while leaving at least one said branch supply duct open, return damper means for selectively shutting off at least one of said branch return ducts while leaving at least one said branch return duct open, and means interconnecting said supply and return damper means whereby when a selected one of said branch supply ducts is closed, a selected one of said branch return ducts is open, and power operated means for moving the same from one position to another simultaneously.