Commodity Fumigation License Practice Exam

What is the maximum size of an enclosure (in cubic feet) that can be aerated by two fans of approximately 2,500 CFM each?

1. 2,500

2. 5,000

3. 10,000

4. 15,000

The correct answer is: 5,000

To determine the maximum size of an enclosure that can be adequately aerated using two fans with a combined airflow of approximately 5,000 CFM (cubic feet per minute), it’s important to consider the relationship between airflow and enclosure volume. The airflow provided by the fans indicates the volume of air that can be circulated in one minute. Therefore, to find the volume of the enclosure that can be effectively aerated, you can use the following principle: for optimal ventilation, it is generally recommended that the entire volume of the enclosure should be exchanged at least once every minute. This is crucial for ensuring that any fumigant or hazardous gases are adequately removed to maintain safety and efficacy. Given that each fan produces about 2,500 CFM, two fans working together provide a total airflow of 5,000 CFM. This means that in one minute, they can adequately circulate through a space with a volume up to 5,000 cubic feet. Thus, an enclosure of 5,000 cubic feet is the largest size that can be aerated effectively by two fans of that capacity, making it the correct answer. Larger enclosures would exceed the capacity of the fans to provide adequate aeration within a reasonable timeframe, possibly leading to