Condensation In Bathroom With No Window - Best Extractor Solution?

[Pgeddon]

If shower doesn’t clear you could extract from it just into the main room and let the beast clear it.

How do you mean? extract from the shower to the main room?

 

[Pgeddon]

100% get rid of flexi duct. I won’t even use it for a meter run.

Considering the room has no windows, I am a bit disappointed that the installer didnt call any of this out.... But hey, no point looking back, best focus on the best way to fix it.

I asked Vent-axia whether there'd be an issue running a 4" centrifugal extractor fan onto a 4" to 6" adaptor, then into 6" ducting. They said not ideal, but fine. So gonna go ahead and buy their Lo Carbon Quadra, and swap the flexi crap, for solid 6" ducting. That will be atleast 3x the extraction rate to my current setup.

If that doesnt sort the problem, then i'll go for the vent-axia 150mm inline ACM. and just install a little loft hatch above the bath for future maintenance access to the inline fan. That will be 11x the extraction rate to my current setup. Though hopefully I dont have to go this far.

 

[Ben-gee]

Let us know how it turns out.

 

[Murdoch]

How are you going to change the ducting?

PS I do think you should talk to the installer so they are aware of the issues you are having, so they can learn

If you think it’s bad now, just wait until the winter

 

[Pgeddon]

How are you going to change the ducting?

PS I do think you should talk to the installer so they are aware of the issues you are having, so they can learn

If you think it’s bad now, just wait until the winter

ducting change will be for the sparks that comes and swaps the extractor fan to the centrifugal.

i'm guessing they will core a larger hole from the exterior wall, tie the new ducting to the old ducting, and push/pull it through hoping it doesn't snag on anything. If it does and the ceiling has to come down to get the bigger ducting in, that's fine cause we'd have to cut a hole to get the in-line up there anyway.

But hoping just the fan change will suffice without changing the ducting, as that's the least intrusive option, obviously.

 

[Murdoch]

Flexi vent is 100% rubbish on anything other than runs that are short or need to go around corners

concorde was shaped as it was for airflow reasons

 

[Pgeddon]

Flexi vent is 100% rubbish on anything other than runs that are short or need to go around corners

concorde was shaped as it was for airflow reasons

Sure - but if the problem is fixed, i'll stop there.

if it comes back with a vengance in the colder months as you rightly pointed out - i'd swap the ducting then I guess.

 

[Timmy D]

Sure - but if the problem is fixed, i'll stop there.

if it comes back with a vengance in the colder months as you rightly pointed out - i'd swap the ducting then I guess.

We appreciate your replies/updates

 

[Pgeddon]

Update on this one,

So i've had the crappy extractor fan swapped over to a Vent Axia Lo Carbon Quadra, Centrifigual type extractor fan.

At maximum speed setting (220 m3 per hour), it is preventing moisture in the room, but by god is it loud, its deafening when you're in the room at round 50decibels.

Not something i'm going to be able to get used to unfortunately. So i've tried setting it to half speed (110 m3), noise is then a bearable 37db, and it does keep the moisture off the surfaces for i'd say about 5mins of shower time, but anything longer than that the room does start getting quite cloud, as if it that there's just too much vapour for it to deal with eventually. At which point it does start to form on the tiles/mirrors etc.

That said, I left it running after 10-15mins after the shower stopped and after that time, the room is quite dry again.


If it only stays wet in the room for 10-15.... will that still be an issue with damp / mould eventually, or is that OK?

 

[ShaunCorbs]

That should be ok

 

[Murdoch]

I thought you said the red lines were marking where the vent runs ????????

extractor fan swapped over to a Vent Axia Lo Carbon Quadra, Centrifigual type extractor fan.

At maximum speed setting (220 m3 per hour), it is preventing moisture in the room, but by god is it loud, its deafening when you're in the room at round 50decibels.

You haven't been using it for long enough to draw any conclusions - and remember its a warm dry time of year

20 minutes minimum for the over run timer IMHO

 

[Pgeddon]

You haven't been using it for long enough to draw any conclusions - and remember its a warm dry time of year

20 minutes minimum for the over run timer IMHO

Yeah fair enough, I need to cut a hole now anyway as the spark seems to think the ducting vent on the exterior wall has been cored out too low, meaning the ducting wont be running straight acrosss the ceiling cavity but instead will S bend down for some reason. He advised that needs addressing, so we're gonna cut a nice hole over the bath and see about fitting an Inline ACM125T in there instead.

125T is 30db at max speed of 330 m3 per hour. Just a case of whether we've got enough room in the ceiling cavity, but we need to cut the hole anyway now to see whats going on with this ducting regardless so can't hurt to try and fit one in there at the same time!

 

[Murdoch]

You need to have a steamy shower and see how the fan gets on, then do it again and partly open and see if it clears quicker - if it does then the gap under the door isn’t enough

 

[gpbeck]

Narrow ducting will be noisier, higher velocity and turbulence.

 

[Ben-gee]

Look at Manrose MF125T, 310m3/hr at 25dB

I’ve used the 4” version a few times when there’s a long ducting run as axial are rubbish unless just pushing through a wall.

Again, I use rigid duct where at all possible.