Passive fire protection (PFP) are components of a building or structure that slows or impedes the fire or smoke without system activation, and usually without movement.
Asia-Pacific Passive Fire Protection Coatings Market Analysis and Size
PFP systems are designed to "prevent" the spread of fire and smoke, or heating of structural members, for an intended limited period as determined by the local building code and fire codes. Passive fire protection measures such as firestops, firewalls, and fire doors, are tested to determine the fire-resistance rating of the final assembly, which is usually expressed in terms of hours of fire resistance (e.g., ?, ¾, 1, 1½, 2, 3, 4 hour).