For cold fog generators, how should the fog be directed and when should it be applied?

For cold fog generators, how should the fog be directed and when should it be applied?

• A. Direct fog toward the ceiling and apply midday.
• B. Direct fog as near to the ground as possible and apply during evening, night, or early morning.
• C. Direct fog horizontally and apply in the afternoon.
• D. Patch fog through doors only.

Answer: (B)

Cold fog generators work best when the fine droplets reach hidden harborages. Directing the fog as near to the ground as possible allows the droplets to infiltrate cracks, voids, baseboards, under furniture, and other low areas where pests tend to hide. Timing the application for evening, night, or early morning reduces occupant exposure and drift because there is less wind and activity, and pests are often more active then, increasing contact with treated surfaces. Directing fog toward the ceiling would let it rise and miss those low-entry spaces, and applying in the middle of the day increases drift and reduces effectiveness. Limiting application to door patches misses many areas that need treatment.

Cold fog generators work best when the fine droplets reach hidden harborages. Directing the fog as near to the ground as possible allows the droplets to infiltrate cracks, voids, baseboards, under furniture, and other low areas where pests tend to hide. Timing the application for evening, night, or early morning reduces occupant exposure and drift because there is less wind and activity, and pests are often more active then, increasing contact with treated surfaces. Directing fog toward the ceiling would let it rise and miss those low-entry spaces, and applying in the middle of the day increases drift and reduces effectiveness. Limiting application to door patches misses many areas that need treatment.