| 摘要 |
As shown in Figure 1 there is one embodiment of a fumigation apparatus in the form of a module (8) including a panel (10) which can be positioned in or at an opening of an enclosed space in use to define a fumigation chamber. Fumigant inlet means in the form of an orifice (12) are arranged in the panel (10) to allow a flow of a fumigant directly into the fumigation chamber during a fumigation interval. The panel (10), when positioned in use, is secure against the passage of fumigant and gases. A nominal number of mixing fans, in this case two fans (16) and (18), thoroughly circulate gases within the fumigation chamber when operating. The module (8) includes a system control box (14) linked to the fumigant delivery orifice (12) and valve system which functions to control the flow of toxic gas into the fumigation chamber. When the fumigation interval is complete, the fans (16, (18) are switched off, the flow of fumigant to the chamber is stopped and then extraction means are used for evacuation of the fumigation chamber gases. The extraction means includes a pipe (28) attached to an orifice (30) located in the lower region of the panel (10), the pipe (28) in turn connected to a contra-rotating fan (34) and an actuated butterfly valve (32) and thence to a pipe exhaust stack (36). Absorption means are operatively coupled to the extraction means to absorb the fumigant extracted from the fumigation chamber. The absorption means is in the form of a removable absorption bed cartridge (40). |
