Discussion
Arrange the steps of a fumigation in order:
1. Seal the structure and check for leaks
2. Determine the free volume and the dose
3. Ventilate thoroughly before re-entry
4. Apply the fumigant and hold for the exposure period
Select the correct sequence.
Answer: B
The dose follows from the volume, the seal must be proved before the gas goes in, and the hold period is what actually kills the insects. Ventilation before re-entry is a safety requirement rather than part of the treatment.
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