Forum menu
its bloody loud tho, sounds like a jet engine warming up ready for the off, hope we get used to that…..
well, its not getting any quieter, and thinking about long term, i think we'll probably run the fan purely during a shower +30 mins, or straight after a bath for 30 mins. (impossible to relax in the bath with it going)
one thing ive thought about doing to make the fan more effective (and quieter) is to drop the speed (its got 2 speeds) by swapping a wire over, and then remove the little plastic non return flap? i figure less speed but more efficiency (less resistance to air flow). youll remember the ducting goes into soffits and almost faces back on itself in the end due to the soffit angle.
not ideal for shifting air, but its all we can do. but that also means that its less likely we'd need the non-return flap do you think? theres not going to be any wind blowing up there, so i can only think its only use would be for spiders, insects, baby robins etc....
good idea or no, we really need to keep the flap.
Our old house wouldn’t drop below the kind of levels of humidity OP is now getting. The big difference is that we were circulating the air around with PPV.
It will take time for fittings in the house to dry out, carpet, wood, everything. But if you use the fan as you say, and sort the kitchen too, by next winter you'll notice a big difference.
I have a tiny axial bathroom fan but it goes straight through the wall, I have a good kitchen extractor and I have 2 stoves which continually shift a lot of air. My house has humidity levels in the high 30s and low 40s currently. I am now actively adding humidity in cold dry spells using the clothes horse to dry clothes instead of the tumble drier. Shifting air really does work but not overnight so don't be too disappointed.
The big difference is that we were circulating the air around with PPV.
sorry, just to be sure, are you saying you werent impressed with PPV as it just circulated air rather than dried it out?
thanks neil, your house is too dry?? oh to have your problem 😀
anyone think removing the non-return flap is a viable idea or recipe for disaster?
anyone think removing the non-return flap is a viable idea or recipe for disaster?
What are you hoping to achieve by removing this? The spring loading on these is ridiculously light, so adds very little resistance to the system & I doubt it adds much in the way of noise.
It's one of those things where you might not need it, but it probably doesn't hurt to leave it in.
How easy is it to remove, try out for a while & replace if it is obviously required?
What are you hoping to achieve by removing this? The spring loading on these is ridiculously light, so adds very little resistance to the system & I doubt it adds much in the way of noise.
when i pressed it it seemed stronger than i imagined, i thought itd move a lot easier. its only a noise issue indirectly, im considering lowering the speed (and thus the noise) and thought to counteract that id make the air exit easier.
sorry, just to be sure, are you saying you werent impressed with PPV as it just circulated air rather than dried it out?
Sorry not very clear. No very impressed by PPV.
Our house followed to some extent the external humidity which varies dramatically in itself.
General range was between 85-65% but the lower humidity was only ever achieved in high pressure times when either freezing cold or hot summer days.
The PPV did more IMO to prompt good air circulation
We’ve just installed a PPV system through Envirovent. Been running for two weeks now. Very happy with it, air is fresher and the condensation has gone from under the windows.
What humidity did you expect the ppv to get to ? Surely external humidity is as low as you can expect .
Surely external humidity is as low as you can expect .
tried explaining this to my wife, the ideal can only be what it is outside. i stuck my meter out on the drive, it read 67%. only way of bettering that is dehumidifier i expect, but no point if the air around it is higher?
i must admit, after a bath/shower and the fan on for another 20 mins, the humidity has on occasion dropped into the mid 50s, but i expect its the same outside at that point too.
Surely external humidity is as low as you can expect .
Warm air has a much greater capacity for holding water, so if cold air from outside at 100% humidity is brought inside and heated up its relative humidity falls significantly.
We used to find that the humidity inside was fine during the really cold months when the heating was on, fine during summer when everything was dry anyway, but much worse during early spring and late autumn when outside wasn't that much colder but was a lot wetter.
Try this:
https://www.lenntech.com/calculators/humidity/relative-humidity.htm
Air at 0 deg C, 100% RH has an RH of just 29% when heated to 20 deg C.
Outside air at 67% rh and ~5C is fairly dry. That air comes in and warms up, as it warms it's rh drops a fair bit, so you can achieve lower.
Yes in sadexpunks case.
I was referring to the ppv case. If your constantly pumping in air from outside pushing out your nice warm lo humidity air.....
well..... i might as well sort the kitchen ducting out whilst the bathroom experiments go on...
looking at the photo of our kitchen below, you can see i have the 120mm round ducting coming up from the fan, and itll want to end in the 110mm x 55mm oblong ducting in the wall. all seems simple enough, a quick look on screwfix and toolstation show all the right parts, reducers, 90 degree elbows etc, so just one question please.
is there any benefit at all to which elbow i have?
or
cant see that there would be, much of a muchness, what do you think? its just different joins in different places, with same end result yes?
EDIT: looking back at the post, for some reason the top one looks obviously better. maybe a smoother bend of the air to travel?
It'll make little difference, both will work fine
seem to have a problem with the fan, just wondering if anyone here can pinpoint the issue....
if you remember, ive bought and installed this
fastlec fan.
as mentioned before, its noisy, but seemes to be effective. just lately tho its hardly ever coming on, and no, its not cos theres less moisture.
before whilst bathing or showering itd be on every time the mirror started steaming up, these days we can get really steamy in there and still no fan.
ive moved the 'moisture-meter' in there to check readings. im pretty sure i set the fan at 60%, and that seemed to tally with the meter reading. ive now moved the meter into the bathroom for a more accurate reading and it can get up to 95% and no fan.
yet earlier, it came on at 80ish. its hit and miss.
anyone hazard a guess as to what the issue is? common sense tells me it cant be anything like a blockage, as that comes after the fans on. for some reason the fan just doesnt seem to know what the moisture is, or if it does, something stops it from kicking in.
any ideas?
ta