Which action should be taken with openings in buildings before applying thermal fog?

Which action should be taken with openings in buildings before applying thermal fog?

• A. Direct the fog toward air intakes.
• B. Close and seal all openings to buildings.
• C. Leave openings open for ventilation.
• D. Ignite the pilot lights to burn away fumes.

Answer: (B)

Before applying thermal fog, seal all openings to buildings. Closing and sealing doors, windows, vents, and other openings contains the fog within the target area, improving distribution where pests are and reducing exposure to occupants and non-target areas. Directing the fog toward air intakes would push the fumigant into the building’s ventilation system, increasing exposure. Leaving openings open defeats containment and allows fog to escape and drift. Igniting pilot lights to burn away fumes is dangerous and unnecessary.

Before applying thermal fog, seal all openings to buildings. Closing and sealing doors, windows, vents, and other openings contains the fog within the target area, improving distribution where pests are and reducing exposure to occupants and non-target areas. Directing the fog toward air intakes would push the fumigant into the building’s ventilation system, increasing exposure. Leaving openings open defeats containment and allows fog to escape and drift. Igniting pilot lights to burn away fumes is dangerous and unnecessary.