Extractor fan query

[stevepbuk]

Hi,

Im wanting a extractor fan for my shower room ( which is really small 90cm x 180cm and sloping from 240 to 310 meters in hight ). I have read various sites that stipulate you need to change the air 20 times an hour. Is this definiltey the case.

I have a extractor in mind but this only extracts 80 cubic meters an hour. Will this suffice or do I need to get something a lot more powerful. My only worry about it not being powerful enough is that there is a Velux window above the shower room and I dont want it dripping all the time.

Thanks for your time.

Steve

 

[Grenage]

20 is a good figure to aim for; not many people get a fan and say "man, I wish I'd got a weaker fan", but plenty of people say the converse.

My bathroom is a quite small (15CM), and I've got an in-line fan that moves 220CM/h - that's 15 changes per hour, and it does the job fine. I still get misting on windows and mirrors, but the air is free of steam,

 

[phatboy]

80 cubic meters is going to be hopeless I reckon.

Can you fit an inline fan, or does ti have to be in the bathroom?

 

[stevepbuk]

Hi mate

Thank for both for your help. It has to be a fan pointing out of the wall as the section of house does not have a loft as its a sloping ceiling. I can get a fan that is 186 m3/h but I am worried incase it makes the shower room freezing. Will this happen or am I worrying over nothing. Is there any disadvantages of having an extractor that exceeds the required extraction rate?

Cheers

Steve

 

[Grenage]

There aren't really any downsides, the room shouldn't be any cooler if the replacement air source (there has to be one) is the rest of the house. It's far better having a fan that moves too much, than too little.

Consider where your fan will go, and where the replacement air will come in - they should be at opposite sides of the room.

 

[stevepbuk]

Brilliant, thanks mate.

The fan is on the opposite side to the door just above the shower so should be ideal. Ive ordered a one that can shift 183 m3/h. Job done.

Thanks again for all your help

Steve

 

[EFLImpudence]

There aren't really any downsides, the room shouldn't be any cooler if the replacement air source (there has to be one) is the rest of the house. It's far better having a fan that moves too much, than too little.

There will have to be some cold air coming in somewhere.

So, while the fan is unlikely to be strong enough to be significantly detrimental you do not want one that is hugely stronger than you need.

 

[Grenage]

That's true; I open my window a little bit (extractor over shower), and even in winter I don't get out freezing.

Make sure there's a gap of about 1cm under the door for the incoming air.