Extractor Fan / Condensation

dinsey

Need some advice on condensation in the roof space.
I have a inline extractor fan fitted over my shower room (sits in the loft) with ducting from the shower room to the FAN and then out through the roof via a tile vent.

Problem being that there has been a build up of water in the ducting from the tile vent to the inline extractor fan. Suspect this is condensation, but this water is running back towards the fan and getting into the pcb board.

Been told that the white ducting going from the fan to the tile vent needs insualtion to stop the build up of condensation, any ideas what to use? As have no ideas on how to insulate a windy flexiable ducting hose.

Thanks

Kiran

Is the duct run particularly long? Are you sure that the fan is functioning properly or does it have a long way to pump the air vertically?

If you do want to insulate the ducting then you can just use loft insulation over the top of it but make sure that it doesnt collapse the hose.

penrhyn

Just cover it with some roof insulation material, rockwool or the like.

dinsey

How weirds that, my wifes names Kiran also.

Not much length on the ducting, max is 1 and half foot.

Isnt any ducting that sits on the loft floor, it either hangs down from the roof tile vent to the extractor fan, or goes from the fan to the shower room below.

any ideas??

WestonDave

could you fit something like this http://www.alertelectrical.com/Fans-And-Ventilation/Grills-Ducting-and-Accessories/Flexible-Ducting/100mm-Condensation-Trap-1440.asp into the ducting, so that you could drain off the condensation to something that you could periodically empty.

Kiran

If its going vertical then the hot air is probably condensing as it goes through the roof tile. I would normally vent horizontally through a wall or have a vent through the soffitfacing down so when the cold air condenses it does not return down the vent pipe.

dinsey

cheers, will probably try the trap, fit it before the ducting goes into the fan outlet,

Will i need one for the inlet which brings the ducting from the shower up?