Positive pressure should not be used for which operation?

Positive pressure should not be used during a vent-enter-search operation because this tactic involves accessing a structure to locate and rescue individuals, often in conditions of reduced visibility and high heat. The goal is to provide a safe environment for firefighters while ensuring that the occupants can be located effectively. Utilizing positive pressure in this context can drive heat and smoke deeper into the building, potentially worsening conditions for both victims and firefighters.

In contrast, other operations like fire suppression and controlled ventilation can benefit from positive pressure tactics. During these operations, positive pressure helps to remove smoke and toxic gases, improving visibility and safety. In search and rescue missions, specifically during vent-enter-search, the risks of using positive pressure outweigh the benefits, as it may compromise safety and hinder the overall mission effectiveness.