Kitchen extractor duct route

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I’m replacing the extractor fan in my kitchen with a cooker hood which will be placed on an internal wall. There is already a large hole trough the external wall where the old extractor fan went through. It’s positioned in an awkward place so was thinking of running a flexible duct from the extractor and into the ceiling and hoping to then use a rectangular duct and 2 L rectangular to circular connectors and run this down the cavity only by about 20cm and to the existing vent. Was just wondering if this would work okay?
 

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Hi,

If that is a loft space above, I would consider taking the extract directly out to a tile/slate vent, or a soffit vent (slightly worse choice!), rather than attempting to slot ducting through a cavity.
 
Last edited:
Your plan is not sound and would effect performance of the extractor significantly.

Vent the unit directly out the roof.
 

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