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Avoiding kitchen duct noise


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My understanding, from Table 5.1a of Approved Document F, is that with MVHR a kitchen should have an extract rate of 13 L/s under boost. With the commonly-used 63mm ID flexible ducting this means a duct airflow speed of 4.17 m/s (if my maths is correct!) if only a single duct is used. Is this what others have done, or have you all doubled-up to avoid noise which I understand can become noticeable above 2.5 m/s?

Edited by MJNewton
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