Fan coil units are a popular choice for engineers when selecting a reliable and efficient source of heating and cooling for a building. They do not require a large central plant to function and with simple proven, controllable technology and installation flexibility, they meet the demands of most commercial and domestic applications. One of the key factors influencing the choice of fan coil units for buildings, such as offices or hotel bedrooms, is noise. As the selection of fan coil units is governed not only by thermal or air volume flow rate requirements, but also by any constraints on the level of noise permitted in the room, the manufacturer is frequently required to select fan coil units based on the predicted noise levels in the room because of the fan coil unit application, however these are influenced not only by the fan coil unit but also by the room itself. During the preliminary design stages, not all the room conditions may be known, but certain assumptions allow the room noise levels to be approximated...

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