The present application includes a module including a panel positionable in or at an opening of an enclosed space to define a fumigation chamber. A fumigation inlet can be arranged in the panel to allow a flow of a fumigant directly into the fumigation chamger. Mixing fans are provided that can circulate gases within the fumigation chamber. A system control box can be linked to the fumigant delivery orifice and valve system to control the flow of gas into the fumigation chamber. The panel can be secure against the passage of fumigant by a seal located around a perimeter of the panel.
