Extractor Fan

garcon6

Our extractor fan in the bathroom has caused some water bubbles to appear on the bathroom ceiling. On investigation lifted the chipboard up in the loft and where the extractor fan links to the ducting thats where the fresh moisture is. I am quite sure that it is a flexible hose there is some grey tape wrapped round it which might have come loose.

Any solutions on how to fix it.

Thanks,

Garcon 6

fluffpot

is the moisture on the inside or outside of the ducting?
If the outside, then you really need a condensation trap to collect this water and divert it out of the house. The problem is that warm air in the fan ducting causes the cold air on the outside of the ducting to condense (on the ducting) and then trickle down to the ceiling.

http://www.tlc-direct.co.uk/Products/BGCT.html

It might also be worth looking at insulated ducting - but it's quite chunky!
http://www.tlc-direct.co.uk/Products/FDAD4.html

MX5huggy

fluffpot wrote: »

The problem is that warm air in the fan ducting causes the cold air on the outside of the ducting to condense (on the ducting) and then trickle down to the ceiling.
]

Cold air does not condense on a warm surface. Condensation will form on the inside of the duct when the warm moist air comes in contact with the cold surface of the duct. This condensation may then be leaking out to the ceiling.

Sealing the duct may help as will insulation on the duct to stop the condensation forming.

garcon6

A very good point from Fluffpot the moisture is on the outside of the ducting, and the water bubbles have spread obviously following the ducting.

garcon6

Thanks for recommended the above websites i will get someone to check the ducting its a flexible hose type. I will probably have to get an electrician to sort the problem out hopefully it won't be to expensive.
Really appreciate your feeback are you in the trade.

Thanks,

Garcon6