Commodity Fumigation License Practice Exam

How should a tarpaulin be positioned for proper gas circulation?

1. 1 foot above the load and 3 feet from sides

2. 2 feet above the load and 1 foot from sides

3. 1 foot above the load and 2 feet from ends

4. 3 feet above the load and 1 foot from sides

The correct answer is: 2 feet above the load and 1 foot from sides

For proper gas circulation during fumigation, it is crucial to create an adequate space between the load and the tarpaulin to allow for effective gas diffusion. Positioning the tarpaulin 2 feet above the load provides sufficient clearance to facilitate the flow of the fumigant. This height allows gases to circulate freely, ensuring that they can permeate through the cargo effectively. Additionally, keeping the tarpaulin 1 foot away from the sides helps to prevent any blockage that could impede the gas’s ability to flow around the load. This arrangement minimizes the risk of gas pooling and promotes even distribution throughout the fumigated area, which is essential for achieving the desired efficacy in pest control. In contrasting this with the other options, while some may have appropriate distances for clearance or side gaps, they do not ensure the optimal circulation dynamics that are critical for successful fumigation.