Window Drencher: This system is used to protect window openings. They are situated above the top of the window, and the curtain of water will protect the glass. Drencher (or deluge) systems can also be used to keep vessels (such as LPG spheres) cool in the event of a nearby fire. Gas flooding systems Traditional flood systems, such as those using carbon dioxide, where the displacement of air within the enclosure is necessary for their successful operation may be inerting systems. Other specialist agents that are used include FM 200, NOVEC 1230, Argonite and Inergen. These systems extinguish fires by displacing oxygen from the protected area. They have the advantage of being "clean", and therefore cause little mess or damage to equipment. However, when used in areas where people are working there is a risk of people being asphyxiated. In such situations, automatic
activation is generally overridden until people leave the area. Typical applications include computer rooms or electrical fires. Hose reels Are designed to tackle Class A fires and provide a continuous supply of water.
Hose reels allow the operator to stand at a distance further away from the fire than the extinguishers allow. Hoses have an adjustable nozzle to allow a jet of water, water spray or a combination of both. The design of the nozzle allows adjustments to be made to the flow of water and it can be switched from water jet to water spray or a combination of the two is allowed. The main drawback with the hose reel is the fact that due to its size, a certain level of physical strength is needed to drag the hose to the location of the fire. Hose reels should be sited in easily identifiable locations with unobstructed access. As hose reels are placed upon escape routes, their size can often cause obstructions during an escape, so, if possible, place them in recesses.
Wet and Dry risers Most buildings have a "wet riser" or "wet standpipe" system where the pipes are kept full of water for manual or automatic firefighting operations.
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