On 15/09/2018 09:45, Tim Lamb wrote:
With the recent fuss about utility fires I was contemplating using 100mm
aluminium flexible duct rather than the usual plastic.

Lower air flow resistance, less likelihood of trapped fibres/fire risk
but... what about condensation issues?

You may get condensation in the duct - but that would be true for ali or
plastic. Having it routed so that it can drain will help.

You can get some twin wall duct that is more resistant to condensation -
although that tends to be a combination of ali foil and plastic.


--
Cheers,

John.

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