For positive pressure ventilation of confined spaces, what type of fans should be used?

When conducting positive pressure ventilation in confined spaces, electric fans are preferred due to their ability to provide a consistent and powerful airflow, which is essential in effectively ventilating potentially hazardous areas. Electric fans are capable of moving large volumes of air quickly, helping to dilute and disperse harmful gases or smoke, and maintain safe atmospheric conditions.

Additionally, electric fans are typically lighter and easier to maneuver than gas-powered options, making them more suitable for use in tight or restricted spaces. They also have the advantage of being quieter, which can be important in maintaining communication among team members during operations.

In contrast, while hand-operated, gas-powered, and battery-operated fans do have their uses, they may not provide the same level of efficiency or safety required for ventilating confined spaces, especially when dealing with flammable or explosive environments where gas-powered equipment could pose a risk. Battery-operated fans may also lack the power needed for effective positive pressure ventilation, and hand-operated fans often do not produce sufficient airflow on their own for this specific application.