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Rubber sealed metal ducting does not need tape or sealant and is more airtight than the standard metal ducting.
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Bathroom zones are just a way of telling which extractor fan you can install in a specific place.
This form will work out the minimum diameter of round ducting you will require to provide equivalent airflow to an existing square or rectangular system. Simply enter the dimensions of your existing ducting in the boxes.
The two dimensions of my square ducting (in mm) are:   and   . The diameter of ducting you require is: