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Figure 4: Comparison of linear indoor wind turbine spectra at 500 m (Lden outdoor 45 dB) and at 800 m (Lden outdoor 40 dB) from a Vestas V80 turbine, with threshold values for annoyance (Vercammen) and audibility (NSG and ISO226)

Figure 4: Comparison of linear indoor wind turbine spectra at 500 m (L<sub>den</sub> outdoor 45 dB) and at 800 m (L<sub>den</sub> outdoor 40 dB) from a Vestas V80 turbine, with threshold values for annoyance (Vercammen) and audibility (NSG and ISO226)