Which of the following is true regarding repair garage ventilation systems?

In a repair garage setting, effective ventilation systems are crucial for maintaining a safe and healthy environment. The requirement that ventilation must be controlled at the entrance ensures that any hazardous fumes or volatile organic compounds (VOCs) from vehicle engines and chemical products are directed away from the workspace and help to promote proper air circulation. This control is particularly important for regulating the influx of unfiltered outside air, which may contain pollutants, and for preventing the buildup of harmful gases indoors.

This approach also enables management of the indoor environment, allowing for appropriate airflow to mitigate the risks associated with exhaust fumes and other emissions related to automotive repair activities. Ensuring that ventilation is actively managed at the entrance helps keep hazardous fumes from accumulating within the workspace, thus safeguarding the health of workers and clients alike.

In contrast, limiting the ventilation to inside air or disabling the system during day hours would not be safe or effective, as proper air exchange is necessary to remove contaminants. Additionally, while filtering incoming air is beneficial for improving air quality, it is not strictly required to filter all incoming air in every situation. Hence, the proactive approach of controlling ventilation at the entrance remains the most critical aspect for ensuring air quality and safety in repair garages.