Condensation In Bathroom With No Window - Best Extractor Solution?

[Murdoch]

So your problem is 2 fold then. Use of the flexi vent and a poor fan

 

[ShaunCorbs]

So your problem is 2 fold then. Use of the flexi vent and a poor fan

I suspect poor quality fan

 

[Pgeddon]

Above in my post (20)

Thats beefy indeed. Would mean ripping the ducting out and going bigger but thats not necessarily a bad thing. I reckon it's probably overkill at 800 odd m3 but maybe you're right.

I guess it cant hurt to try a centrifugal one first thats three times the extraction of my current.... and if that doesnt cut the mustard as it were, then I can just go nuclear with an 8'' inline.

 

[Murdoch]

I suspect poor quality fan

flexi vent slows the airflow down. Longer runs are far better using soil pipes

 

[Pgeddon]

flexi vent slows the airflow down. Longer runs are far better using soil pipes

Is 2.5m considered long? Ideally I want to try and fix this with the least amount of ceiling coming down as possible.

are some types of flexi better than others? all the inline ones i've got in the loft dont use the aluminium stuff, but they're like a white material instead.

 

[ShaunCorbs]

flexi vent slows the airflow down. Longer runs are far better using soil pipes

Yes if not straight eg not supported so duct rises and falls

 

[ShaunCorbs]

Not really on average most are 1.5-2.5m on average

Best is solid and sloped to the grill

 

[Ben-gee]

Can you push a length of 4” soil pipe in from outside, where your current grill is?
Then connect up a centrifugal fan to that, this would not entail pulling any ceiling down and may be enough to solve the problem.

 

[Pgeddon]

Can you push a length of 4” soil pipe in from outside, where your current grill is?
Then connect up a centrifugal fan to that, this would not entail pulling any ceiling down and may be enough to solve the problem.

That is my hope yes. It's an odd layout though this house, it was a bungalow at one point and when extra floors were added they retained the original bungalow ceiling, meaning all the cavities between the ground and first floor.... are not run of the mill haha. I recall it being multi cavitied and all sorts of weird stuff in there.

So I think im gonna try the centrifugal first as phase 1. If not good enough, try change the ducting to solid. If still too wet, then keep the solid ducting and go for an inline one.

Maybe a silly question - but can you run a fan with wider ducting than recommended? I can see how running smaller would cause too much back-pressure. But if I bought a 4'' centrifugal, then one of those 4'' to 6'' converter pieces for the ducting, then ran 6'' ducting..... that would be fine?

Asking because I guess then if I DO swap to an inline in future, a 6'' one would be heaps more powerful.... so seems a better strategy overall.

 

[ShaunCorbs]

Yes will be better as there’s less resistance

 

[gmartine]

bad idea. Those are rubbish imho

I'm sure you're right but you'd think it wasn't beyond man to produce a decent one.

 

[Ben-gee]

I'm sure you're right but you'd think it wasn't beyond man to produce a decent one.

I’ve used the shower light but put a decent mixed flow in-line fan with it and binned the rubbish they come with.
Then it is a pretty good solution (although not for this OP!)

 

[gpbeck]

Here’s what I’d do. Remove a tiled column by the bath, replace with hollow structure connected to low level 150mm waste then out through the wall at low level. Slight drop on the 150mm pipe. Plenty of room at side of bath for a beast in-line fan. Replace column and hide a large grill at the top of the back of it.

 

[gpbeck]

Here’s what I’d do. Remove a tiled column by the bath, replace with hollow structure connected to low level 150mm waste then out through the wall at low level. Slight drop on the 150mm pipe. Plenty of room at side of bath for a beast in-line fan. Replace column and hide a large grill at the top of the back of it.

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

 

[Timmy D]

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