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Sound

Requirement	Noise levels within rooms
	There are no requirements for internal noise levels from external sources.

VELUX - Individual roof window sound insulation
34 pane variant	32dB (complete window)
59 pane variant	32dB (complete window)
73 pane variant	35dB (complete window)
60 pane variant	37dB (complete window)
65 pane variant	35dB (complete window)

A difference of 2-3dB is equivalent to approx 50% reduction in noise frequency level.