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Cold aisle Fire Suppression Systems

Communication centres, data centres,and server rooms, all produce significant heat output. Cooling them can consume large amounts of energy. In the last couple of years "cold aisle" systems have been used to reduce the amount of energy required to keep these areas at their optimum operating temperature. This is achieved by creating both "warm aisles " and "cold aisles" with the server racks acting as the physical seperation. In addition a solid roof is installed above the cold aisle  and under floor segregation is installed to enable chilled air to be pumped directly into the cold aisle which is then drawn through the racks and into the warm aisles. This air is then returned at high level within the enclosure into the air conditioning system.

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Cold aisles present a number of challenges when it comes to correctly engineering Gaseous Fire Suppression Systems, Detection Systems and VESDA Systems to successfully detect and extinguish a fire.

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Typical suppression systems employ a fixed distribution pipe work with dishcharge nozzels located within the room space and any sub voids.With cold aisle systems consideration has to be given to providing suppression agent into further sub voids such as the segregated floorvoid section and the cold aisle itself. Detection within these areas is also required to meet the requirements of BS 6266.

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Positioning of detection devices although dictated under BS6266, must also take into account air flow through the server racks, into the warm aisles and into the extract units.

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In a normal Server Room applications, audible and visual alarms to alert personnel in the event of a fire are installed within the enclosure. Where cold aisle systems are employed, consideration has to be given to providing these devices within the cold aisle area itself in orderto meet audibility requirements. High ambient audibility within the cold aisle due to operation of the server units will easily result in alarm devices outside of the cold aisle being unheard.

In addition to the above hold off buttons, system status units and manual release points must also be installed adjacent to each entrance to the projected area.

We have now completed a number of these complex fire engineering projects and can offer a wealth of experience to engineer a practical solution for you.

Should you require any further information regarding cold aisle or any other of our fire suppression products or services, please contact Paul Booth te. 0845 054 0516 or email



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