Which of the following is an essential safety procedure in duct installation?

Ensuring proper ventilation during installation is crucial for safety when working on duct systems. Proper ventilation helps to prevent the buildup of harmful airborne contaminants and ensures adequate airflow during the installation process. This is particularly important when using materials or adhesives that may release fumes or other hazardous substances. Good ventilation reduces the risk of respiratory issues and creates a safer working environment.

In contrast, the other options would not contribute positively to safety. Wearing gloves only does not address other safety concerns related to the installation process. Using tools without training increases the likelihood of accidents and injuries due to improper handling. Working alone can be dangerous, as it may leave the technician without immediate assistance in case of an emergency or injury. Thus, ensuring proper ventilation stands out as a comprehensive safety measure necessary for successful and safe duct installation.