In line fan query

[currie123]

Hi guys

Is there any reason why an in line fan which I was proposing to site in a loftspace above the shower cubicle couldn't be vented out through the roof?

I have fitted a few of these in line fan kits recently but always vented them through sofit boards or even horizontally through exterior wall in lofts, reason I ask is I thought maybe the flexi duct running mostly vertically and out through the roof via a slate kit may not be suitable for these type of fans? Can anyone advise ?

Thanks

 

[telectrix]

should be OK, but not what i would recommend. holes in roofs, no matter how well you seal them always manage to leak.

 

[SYKRAPS]

I would adhere to the instructions currie123, and if they are unclear as they often are with fans get the guys from whom you bought the fan to ring tech support for you.

It must be doable otherwise there would be no market for roof tile vents.............

My concern would be condensation running back down the ducting which would not be nice whilst having a hot shower.

 

[currie123]

Thanks for the input, yes i know I find it hard to believe water wouldn't get into some if the roof slate vents you can get.

Think I will likely just go for a standard 12v ceiling mounted fan above the shower but still vent through the roof to save me coring a hole through stone wall, got a daft builder willing to do the roof work so il let him do that!

 

[SYKRAPS]

That would give you the same issues though......you can get some really powerful in-line models that would do a better gob and extract more litres per second than a 12v ceiling mounted model.

I think you can also get condensation traps that allow for an overflow to remove the condensation via an overflow pipe.

 

[currie123]

Yes I know you can get some powerful in line fans but its the usual case of the landlord won't pay that much ££. My main concern was that the smaller in line fan wouldn't be suitable to vent out vertically as they obviously sit horizontslly in the loft? and after considering it and your opinions then it probably isn't a good idea.

A standard 12v fan ceiling mounted vented out through the roof via a flexi would do the job, I wouldn't propose to go straight up and out as the water would run straight down the vent, would leave a bit if play in the flexi.

 

[SYKRAPS]

Yes and some models list a venting length

 

[MarkieSparkie]

A standard 12v fan ceiling mounted vented out through the roof via a flexi would do the job, I wouldn't propose to go straight up and out as the water would run straight down the vent, would leave a bit if play in the flexi.

This scheme seems seductive in theory. In practice however the flexible vent pipe will need to be substantially thermal insulated and/or drained, otherwise condensation will build up quickly over time, eventually this trapped water will spill to the lowest point in the system probably shorting and/or burning out the fan motor.

 

[Stroppy]

You definitely don't want sagging flexi extract pipes. They do fill up with condensation and all sorts of other crap which makes the water go brown and smell like sewage. Eventually some poor sod will go into the loft to find why the extractor doesn't work and move the pipe sending a couple of litres of sewagy water and a dead bird pouring down through the extractor and all over the beautiful kitchen and half-prepared dinner. I speak from experience.