Which item is designed to protect the respiratory system from airborne particles?

The item designed specifically to protect the respiratory system from airborne particles is the dust mask. Dust masks function by filtering out dust, pollen, and other particles that can be harmful when inhaled, making them essential for individuals who work in environments such as construction sites, woodworking shops, or agricultural settings where particulate matter is prevalent.

In contrast, the other tools listed serve different purposes unrelated to respiratory protection. A drift punch is a tool used to align holes or drive pins; an emery dresser is used to clean and reshape grinding wheels, and an extension is typically used for electrical tools to reach distant outlets or fixtures. None of these items offer any filtration or protection for the respiratory system, highlighting the unique function of the dust mask in safeguarding against airborne contaminants.