Condensation from extractor fan

Yorky

I noticed a pool of water on the ensuite floor this morning and on closer inspection it is coming from the ceiling mounted extractor fan. Initially I thought it must be a burst pipe but it is actually condensation dripping down the duct from the inside of the roof vent.

There is a radiator more or less beneath the fan so the heat must be rising through the fan in to the duct and then condensing. I haven't noticed this before as I don't normally have the heating on upstairs but did yesterday. Is there any way of preventing this? The extractor fan has self-closing fins which should prevent much of the rising heat getting in to the duct.

gman2k

Check the ducting route up throught the attic if possible. If it's not insulated, then wrap some insulation around it, from ceiling level to exit point. This should help with condensation dripping back down the duct.

RKQ

I agree, the pipe is uninsulated. Its been very cold the last few days, the cold air is meeting the warm air in the pipe and condensating. This problem would be worse in a aluminium foil pipe, as opposed to plastic.

Insulate it and it sholud be ok.