Pressurisation ductwork

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Passive fire protection system

title: "Pressurisation ductwork" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["active-fire-protection", "pressure", "heating,-ventilation,-and-air-conditioning"] description: "Passive fire protection system" topic_path: "general/active-fire-protection" source: "https://en.wikipedia.org/wiki/Pressurisation_ductwork" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Passive fire protection system ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/a/a1/Vermiculite_board_fireproofing_002.png" caption="ductwork]] (sheet metal) externally fireproofed with pressed vermiculite boards, stapled together."] ::

::figure[src="https://upload.wikimedia.org/wikipedia/commons/b/bc/Durasteel_pressurisation_duct_commerce_court4.jpg" caption="Pressurisation ductwork made of [[Durasteel"] ::

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.

Purpose

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.

Requirements

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

Systems

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 intumescent paint.

::callout[type=info title="Wikipedia Source"] This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page. ::