Pressurisation ductwork is a passive fire protection system. It is used to supply fresh air to any area of refuge, designated emergency evacuation or egress route.

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The purpose of pressurisation ductwork is to maintain positive pressure in building spaces to prevent smoke from entering from other spaces in which a fire is occurring. It is typically used in exit stairways, corridors, and lobbies.

Pressurisation ductwork is certified on the basis of fire testing such as ISO 6944.

There are two means of providing fire-resistance rated ductwork:

• Inherently fire-resistant, or proprietary factory assembled ducts which are made of sheet metal shells filled with mixtures of rockwool, fiber and silicon dioxide
• Sheet metal duct with exterior fireproofing materials such as blanket rockwool, ceramic fiber, or in-tumescent paint.

• Heat and smoke vent
• Fire protection
• Smoke exhaust ductwork
• Emergency evacuation

Wikimedia Commons has media related to Pressurisation ductwork.

• ISO 6944-1:2008 Fire containment -- Elements of building construction -- Part 1: Ventilation ducts