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FOCUS


Safety equipment


Several factors influence how successfully


ventilation can be implemented by creating openings in a roof. Examples are as follows: • the fire scenario and intensity of the fire •


room volumes and geometries


• the size and positioning of inlets • the prevailing wind conditions • access to mechanical ventilation • the capacity of the firefighting crew • equipment to create openings • the roof structure Tactics during the fire and rescue operation are influenced by the roof structure, as well as the positioning and size of the openings, and the time for and problems with the work of making the openings, including the safety precautions for the crew and need for special tools. If the firefighting crew has the right equipment and the roof structure permits an opening to be made quickly, the fire gases and fumes can in all probability be vented out enough to simplify the work of firefighters. There follow descriptions of tools which are commonly used to create openings in the roof and also examples of openings made in different roof structures frequently found in Sweden. Unconventional measures, such as demolishing walls or roofs using excavators or crane lorries, are not considered. In certain cases, these methods may very well provide


30 MAY 2019 www.frmjournal.com


The tools discussed below are generally available to the fire and rescue services, and are used for the purpose of creating openings. They are divided up into electric motor powered tools, internal combustion engine tools, hand tools, and special equipment.


Electrically powered tools Tools powered by electric motor are often smaller and lighter than the equivalent tools with internal combustion engines. The function of an electrically powered tool is not diminished by the fire gases and fumes when creating openings for fire ventilation. One of the disadvantages of such tools is


that freedom of movement is limited by cables, and that access to electricity can be restricted in certain situations. Another disadvantage is that electrically powered tools often have a lower output than the equivalent tools with internal combustion engines.


Engine powered tools These tools can be used regardless of external power sources and produce a comparatively


suitable solutions to tactical problems, but they should be used with a degree of caution.


Tools for openings


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