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Where to place fans
The location of fans is another factor in maximising effectiveness. A detailed knowledge of building layout, including which rooms may be busier (and when), will be crucial in establishing the best areas for ventilation.
For example, the optimal solution may be a roof fan, which is designed to give ventilation through roof outlets. There are models created to provide high levels of flow or pressure in centrifugal, mixed and axial flow configurations.
Effort should be made to allow a gap equivalent to the diameter of one fan between the fan intake and nearby locations for internal locations. Without this, the impeller can become deprived of air, which increases resistance and lessens air flow.
Minimising vibration and noise levels
Efficiency and overall performance will always be the most important factors for facilities managers to consider. However, issues like noise and vibration should also be accounted for. Ensuring neither of these are too disruptive to building occupants is crucial to providing a comfortable space. While sound cannot be avoided, it can
be reduced. For instance, airborne and duct-borne noise can be limited by using attenuators, while structure-borne noise can be lessened by isolating the fan from the structure or the duct itself. Additionally, using lined fan types and duct lining may alleviate duct-borne noise. Vibration is another inevitable side-
effect, as fans cause the structure on which they are mounted to vibrate. Vibration isolators should be chosen to provide the minimum deflection required. They should also be appropriate for the fan and the environment in which it will be operating.
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Maintaining equipment
Facilities managers will be aware of the need for ongoing maintenance and servicing across all types of equipment. Ventilation is no different, and regular checks on a system help ensure IAQ remains as high as possible.
Maintenance schedules will vary, as they depend on which fan type is being used, the atmosphere within which it operates, and other variables. Those in charge of the upkeep of fans should consult the manufacturer and create a detailed maintenance schedule.
Facilitating healthy air, facilitating healthy buildings
Considering their role in ensuring a comfortable and safe building, facilities managers need to appreciate the importance of delivering good IAQ. This requires them to stay aware of updates to key technologies in ventilation design. They must also make sure that the aspects mentioned above are factored in when making improvements to existing systems.
webstore.uk.fujitsu-general.com
• Download extensive sales and technical documentation
• Order units, accessories and spare parts for next day delivery (time restrictions apply)
• View historical account information, such as orders, deliveries and invoices
Fujitsu General Air Conditioning (UK) Ltd +44 (0)208 731 3450
sales@fgac.fujitsu-general.com
www.fujitsu-general.com/uk
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