Install Bathroom Exhaust Fan Duct Through Soffit
Extractor fan ducted through soffit/fascia board
Extractor fan ducted through soffit/fascia board
Twilkes
Original Poster
478 posts
111 months
Friday 3rd March 2017
An electrician has quoted for installing a bathroom extractor fan in the ceiling and ducting it out through the wooden fascia board under the roof. I'm worried there's a danger that the damp air will just get sucked back into the roof space. No idea what kind of soffits we have but the loft is drafty on a windy day so they're either continuous vents or there's a lot of them.
This isn't my house but the roof/fascia structure is pretty much the same: http://www.rightmove.co.uk/property-for-sale/prope...
Should I be worried? I would struggle to get a roof vent because the electricians I've spoken to can't easily get a roofer involved to sort the tiles, and I don't want to drill through the wall when the ceiling above the shower is only a few feet from the roofline anyway. (actually, would that cause a draft to come through the ceiling vent?)
Edited by Twilkes on Friday 3rd March 09:05
Friday 3rd March 2017
The duct/fan will have a one way "valve" on it so cold air can't come back into the room. I doubt very much the warm air will get sucked back into the roof.
hman
7,480 posts
166 months
Friday 3rd March 2017
I have mounted my extractor fan outlet under the soffit board (so it points straight down) - however I added a grille with insect screen which deflects the air out from under the eves.
I was a bit concerened about the possibility of damp air going back in but I could see from the vapour being emmitted down and out at 30-45 degrees that this wasnt a problem anymore.
http://www.ebay.co.uk/itm/White-Square-Louvre-Air-...
Just make sure your fan is power full enough to project it far enough out I used one of these :-
http://www.screwfix.com/p/manrose-in-line-centrifu...
Friday 3rd March 2017
Tbh I don't like venting moist air out of soffits for just that reason as some will invariably end up back in the roof space. I'm not that keen on venting out of the wall either as invariably in a first floor bathroom it'll exit just below the eaves. Given that most lofts are full of fibreglass or mineral wool insulation which are surprisingly good at trapping moisture, avoiding warm moist air getting in there is generally a good thing even if the loft space is ventilated.
Venting out of the roof is much preferred imho as the water vapour is not going to get anywhere it shouldn't. It's just harder / more expensive to retro fit as most non roofing trades don't like to be up on the roof for understandable reasons.
If you're struggling to get an electrician to arrange for a roofer, you'll probably need to arrange for the roofer yourself to install the roof vent. All the electrician then needs to do is connect up the ducting in the roof space. NB make sure that the ducting is insulated and has a condensation trap fitted with the condensate waste piped away appropriately.
hman
7,480 posts
166 months
Friday 3rd March 2017
or just do it like i did, leaning out of the bath room window with a hole saw into the soffit and a grille facing it away from the roof.
problem solved (it took less than a morning to complete the whole job).
f
k chopping up your roof for a bathroom extractor ££££££££££££££'s and a possibly leaky roof in the future.
Friday 3rd March 2017
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Install Bathroom Exhaust Fan Duct Through Soffit
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