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Fancell

The Cannon Datacom 'FanCell' comprises of a range of fan tray assemblies which create a forced-air flow through the equipment chamber.

How it works

This forced-air flow is drawn from outside the cabinet, ideally through filters, to avoid any ingress of external contaminants. The lower temperature ambient air is pulled through the equipment housed within the cabinet. During its passage, heat transference of the warm air surrounding the equipment to the cooler ambient air takes place. The warm air is forced to rise by both natural convection and the airflow created by fans. This creates a slight negative pressure in the top of the cabinet. As this air is exhausted to atmosphere, cooler ambient air is being introduced into the bottom by the forced-air flow.

Condensation considerations

In low ambient temperatures, where the effect of very cold air and resultant condensation is to be avoided, Cannon Datacom can provide a switching system to de-activate fans to minimise the air flow. Alternatively, the temperature can be raised with anti-condensation heaters.

Excellent Results

Trials carried out within the Cannon Datacom environmental chamber give consistent results of a ∆ t/Watt of 0.018°C. This would equate to a temperature rise of 7°C above the ambient air temperature for a cabinet with equipment dissipating 400 Watts of wild heat. 400 Watts x 0.018°C= 7.2°C (These figures are for a typical cabinet fitted with a 'FanCell').

Prolonging component life by utilising Cannon temperature sensing

A more sophisticated system couples the 'FanCell' with a Cannon Datacom temperature sensing device to maximise the efficiency of the fans. The system will prolong the mean time between failure by reducing the speed of the fans to suit the required airflow during the cooler periods. 'FanFail' alarms are also available to provide monitoring and maximum protection of the system.

With safety as a priority, 48 volt DC fan systems are usually provided. A range of power supplies is available.

Air filtration systems may be used at the air intake points. Labyrinth venting is designed into the air exhaust vents within the roof section to maintain the integrity of the cabinets IP rating, by preventing the ingress of water.