What is the ‘two-in, two-out’ rule?

The 'two-in, two-out' rule is a safety guideline that mandates that two firefighters must enter a burning structure to perform interior operations (such as search and rescue or fire suppression) while two other firefighters remain outside ready to provide support and ensure safety. This rule is essential for ensuring that there is a rapid response capability in case of an emergency, such as if the firefighters inside encounter danger and need immediate assistance. The principle behind this rule is rooted in the concept of firefighter safety and ensuring that at least two personnel are always dedicated to backup and support, maintaining safety protocols during operations.

This guideline helps to mitigate risks associated with firefighting, as it ensures that there is always a team ready to assist in an emergency, contributing to both the safety of the firefighters involved and the effectiveness of the firefighting efforts.