When are fire shelters considered to be most effective?

Fire shelters are considered most effective when there is airspace between the shelter and the body. This airspace is crucial because it creates an insulating layer that helps to protect the firefighter from the intense heat generated by the fire. The air trapped between the shelter and the person acts as a barrier, which reduces the amount of heat transferred directly to the body. By promoting this airspace, the shelter can maintain a safer environment inside, thereby providing greater protection.

Additionally, the design and materials used in fire shelters are intended to reflect radiant heat and provide a measure of thermal insulation. Being too close to the body could compromise the shelter’s effectiveness, as it could lead to direct heat transfer, reducing the protective benefits. Therefore, maintaining some distance allows the shelter to function as designed, making it a crucial consideration for effective use during a wildfire situation.