A nurse is assisting with a community health presentation about home safety precautions when there is an outdoor chemical disaster nearby. Which of the following instructions should the nurse include?

A. Incorrect. In the event of an outdoor chemical disaster, individuals should stay indoors and take shelter rather than exiting the home. B. Incorrect. Opening the dampers of fireplaces could allow outdoor contaminants to enter the home. C. Correct. Covering heat registers with plastic and tape can help prevent outdoor chemicals from entering the home through the ventilation system. D. Incorrect. Turning on ceiling fans and air conditioners could potentially bring outdoor contaminants indoors through the ventilation system.