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.
These in-line fans are often controlled by a switch.
Please see each individual product for available control
For fans with in-built overun timers, please see 'Over Run Timer
Controlled In-Line Fans for Large Kitchens'
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