Interface Zones Between Components
topic
Interface zones between turnout coat cuffs and gloves, coat collar and hood, and trouser leg and boot require adequate overlap and secure connection to prevent heat and flame penetration through the gaps between components during physical movement that separates adjacent garment edges, with EN 469 and NFPA 1971 specifying minimum overlap dimensions and some standards requiring interface testing of components in combination to verify that gaps between components do not expose unprotected skin during standardised movement sequences.
Role
Addresses the most vulnerable points in total ensemble thermal protection where component interfaces create potential gaps in coverage during the bending, reaching, and climbing movements of firefighting operations, with interface design being an often overlooked but critical aspect of ensemble performance since a brief gap exposing unprotected skin at a cuff or collar interface can cause a severe burn from momentary flame contact that would not injure protected areas.