In that case a condensation trap may need to be fitted to the ducting to prevent the water running back down into the fan, but you will need to work out where to pipe the collected water. Also, by using insulated ducting it can help prevent condensation forming in the first place.
Xpelair DX100 is not expensive. On Ebay the Pullcord, PIR & Timed versions are =A324, =A347, =A327 delivere= d respectively for full kits. The LV versions will be more expensive, the DC fan will last a little longer but the PSU may not last as long as the fan.
DX100 can be mounted in a ceiling with ducting slipped over the rear - it is not wall only.
For the size suggested a DX100 sounds fine.
If you're aware of the issue, you can make sure the ducting slopes down towards the external vent, but needs to be waterproof. The one in the ceiling (loft) here seems to be bog-standard sewer pipework, so it is waterproof, and it has the loft insulation draped over it, not under it.
A friend's house had the extract pipe going up vertically from the bathroom ceiling through the loft to a tile vent near the apex. That would continually drip water back into the bathroom. Originally they thought it was a roof or plumbing leak.
In message , Andrew Gabriel writes
I wondered about this when i did the one in our old house.
Loft mounted fan, flexible ducting from ceiling to fan, and fan to an upright rigid pipe through roof. Probably about 3 m or so of flexible and about 1.5 - 2 m rigid. any condensation would have collected in the flexible pipe between the fan and rigid pipe
in the end I decided to wait and see. If there was any condensation in it is was not enough to ever be a problem for me to bother about
If that happened too efficiently I wouldn't feel at home :-)
Sounds very neat. 150's probably too big for a small room; 100 should be enough.
"It's relative, you know". "Oh, absolutely!".
As the outlet will be at the lowes point (other than the ceiling), I'd planned to have the fan mounted above the intake and the ducting going downhill from there.
I'll have a look - thanks.
lights!
I've never had any bother with inexpensive extractors - I had a pullcord/humidistat RDL which has had to be replaced recently but I think that went in with the shower build over 20 years ago and the Greenwood one in the bathroom is the same age and is fine.
One thing I would take advantage of this thread to ask is about external vent covers - I had the inexpensive flap type from Screwfix, but was quite glad when they died as the noise in a wind was very irritating. What is better and where are they available?
Rob
I must admit that I've been wondering about getting one so cheap that if it dies in 2 or 3 years I just replace it. Another thought: I have an old 3-speed, reversible, Vent-Axia fan of 9" dia. I could mount that in the loft and adapt ducting to fit. Only problem is I'm limited to about 100mm to keep within the width of the fascia, so I guess that the back pressure would be too much.
Opps missed this bit. Anybody got recommendations, please?
Fixed grilles and a fan with electronically operated flaps. Although in your case as the grill is in the soffit and not going to get 100mph winds straight down it then just a fixed fan will do.
I have stainless steel gravity flap vent covers from tool station on each bathroom. They work very well. Winds in our location have hit 125mph+ over winter. No noise from the vents and they stopped dust and dirt being blown into the bathrooms.
You obviously don't have pikeys passing your house:-)
High enough above the ground to prevent them, I hope. I spend my time worrying about the solid copper drainspouts and gutters.
That's reassuring. What does concern me is that the flaps will be in a surface that's nearer horizontal than vertical, so gravity won't keep them shut. Possibly a plain vent in the soffit and a flapped one in the ducting.
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