Smoke ventilation
adhere: to ensure that the system operates correctly when called upon, it is essential that the process of planning, design, installation, commissioning and maintenance are undertaken by competent parties. For example, for the system designer a comprehensive understanding of the regulatory authority’s guidelines for product, installation and building codes of conduct, and a familiarity with the requirements set out, is essential.
System operation
A ‘best in class’ system will meet the challenges of demands such as these, while catering for a number of other issues commonly raised by smoke control system requirements. A purge feature is a manual function of the system that will enable the safe removal of smoke from indoor areas once a fire has been extinguished. Stairwell or lift elevator shaft or lobby pressurisation is a very common requirement that keeps exit routes clear of smoke by maintaining positive pressure along those routes. As smoke spreads to the different fire
compartments in a building, it could be necessary to lock out subsequent signals. Alternatively, the most comprehensive systems will also be able to prioritise the
containment or extraction of smoke in specific areas. Periodic testing, especially in dedicated
systems, is also essential to ensuring that fans and dampers will work as expected in an emergency situation. With such critical but complicated systems, testing of correct operation can be a significant investment. Finally, in buildings that have no smoke
control systems, it is common for any fans (used by HVAC systems) to be shut down in the event of an alarm, to prevent the spread of smoke and fire. When the time comes for these fans to be restarted, the risk of overloads to the electrical circuitry can be commonplace. Therefore, a sequential fan restart feature that enables the gradual restart of these fans minimises the chance of electrical surges. Whichever options are chosen, the role of
smoke control in fire protection is significant and specifiers need to be fully aware of the requirements and the technical options that are available
John Newton is head of products and services at Advanced. For more information, view page 5
Further information is available from www.
advancedco.com
FOCUS
www.frmjournal.com MARCH 2019
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