Outdoor equipment (OE) covers a wide range of very different mechanical devices. A survey on these types of equipment can be found in the EC directive 2000/14/EC 1. Although the variation of OE is very wide, the predominant noise sources are similar in many cases due to the fact that most of these devices are operated by internal combustion engines. This means that there are two major noise sources on most of these devices - "engine " and "cooling system (fan) ".
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