Abstract: A portal apparatus in the form of an arch-shaped pipe fitting (10) for use with a fumigation chamber that in part incorporates a flexible canopy. The pipe fitting (10) can be seated on the ground (12) so as to be positioned between the canopy and the ground (12). A sealing surface (22) on the pipe fitting (10) is contactable with the flexible canopy so as to provide a gas-tight seal. An assembly for directing the flow of gas in general, the assembly being operable in various configurations, and comprising first and second gas inlets and outlets respectively. An assembly for operatively coupling gas extraction, treatment and recirculation apparatus, and comprising first and second gas inlets and outlets respectively that can be selectively coupled in first and second configurations.

Abstract: A method of removing a residual gas from inside a conventional shipping container is disclosed. The method first involves the step of accessing the container by opening a door of the container and fitting a panel to the open door space. Next the method involves extracting at least some of the residual gas present in the container via an outlet valve located at the panel using an external suction pump. Finally the method involves providing a flow of a flushing gas into the container via an inlet valve located at the panel to flush residual gas from the container. The total pressure of gases in the container can be monitored and controlled by adjusting the flow of gases in the inlet and outlet holes or valves.