What is a closed transfer system, and in what situations should it be used?

• A. A system that transfers water into tanks; used for irrigation
• B. A system that minimizes exposure during mixing and loading; used for highly hazardous pesticides or when label or safety programs require it.
• C. A system that reduces ventilation during mixing only
• D. A system for cleaning equipment after use

Answer: (B)

A closed transfer system is designed to minimize exposure during mixing and loading by keeping the pesticide inside a sealed path from container to spray tank, so nothing is open to the air during transfer. This containment reduces spills, splashes, and inhalation of vapors, protecting the worker as the mix is prepared. It’s especially important when handling highly hazardous pesticides or when the label or a safety program requires this type of system. This approach is not about transferring water, altering ventilation, or cleaning equipment after use; its purpose is to keep the pesticide contained during the critical mixing/loading step and to meet label or program safety requirements.