What does the term "positive pressure" refer to in ventilated equipment?

The term "positive pressure" in ventilated equipment specifically refers to a method of airflow that keeps contaminants from entering a space. This is achieved by creating a higher pressure inside the ventilated environment compared to the outside. The positive pressure forces air out of the openings, making it difficult for external contaminants to infiltrate.

In hazardous environments, such as those involving hazardous materials, maintaining a positive pressure is crucial for ensuring the safety of personnel. It helps in effectively controlling the spread of contaminants, thereby providing a safer working area. This concept underlines the importance of airflow dynamics in hazmat operations, ensuring that workers are protected from airborne toxins or dangerous gases.

The other options, while related to the general context of safety and equipment operation, do not accurately define the specific meaning of "positive pressure" as it pertains to ventilated systems.