There is disclosed a refrigerated transport container 100 comprising: a cargo space 105 for containing an interior gas； a gas transfer membrane 230 configured to transfer component gases at different rates (such as carbon dioxide and oxygen), the gas transfer membrane having an interior side to receive interior gas from the cargo space 105 and an exterior side in communication with a gas exchange portion 250 of an exterior gas pathway 240； an air mover 244 configured to drive an exterior gas flow along the exterior gas pathway 240 for gas transfer over the membrane； and a flow controller 226 configured to selectively activate the air mover to control transfer of a controlled component gas across the gas transfer membrane. There is also disclosed a refrigerated transport container in which flow of exterior gas along an exterior gas pathway is heated prior to gas transfer at a membrane, and corresponding methods of operating a refrigerated transport container.
