pressurisation ductwork
{{Short description|Passive fire protection system}}
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Image:Vermiculite_board_fireproofing_002.png (sheet metal) externally fireproofed with pressed vermiculite boards, stapled together.]]
Image:Durasteel_pressurisation_duct_commerce_court4.jpg]]
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
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.
See also
External links
{{Commons category|Pressurisation ductwork}}
- [http://www.iso.org/iso/home/store/catalogue_ics/catalogue_detail_ics.htm?csnumber=50385 ISO 6944-1:2008 Fire containment -- Elements of building construction -- Part 1: Ventilation ducts]
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