A mobile temperature controlled container having an enclosed indoor section that closes against the one wall of the container. A blower wheel compartment is contained within the housing which has a spiral-shaped lower section that communicates with an upper discharge section. A blower wheel is mounted within the lower section of the compartment and the front of the enclosure is closed by a cover. The cover contains a circular inlet opening adjacent the blower wheel and a rectangular outlet nozzle located adjacent the discharge section of the compartment. The nozzle is arranged to discharge conditioned air into the container and has a vane thereon for optimizing the discharge flow into the container.