ᐅ Proper Ventilation for an Interior Bathroom

Created on: 30 Jan 2014 13:28
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Hello,

a practical question for you all. I hope this is the right forum section for it? If not, please feel free to move it, thanks.

We have an interior bathroom, so without a window. There is a ventilation fan that always turns on when the skylight is switched on. After bathing or showering, I sometimes feel the ventilation time is too short if I don’t leave the skylight on longer. Are there any guidelines that might help balance room size, duration, and humidity?

Best regards, Gerda
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Paule-1
3 Feb 2014 04:20
Hi Gerda, you can find information about this in the regulations of DIN 18011 and DIN 18022. For example, a bathroom without a toilet must be 4.5m² (48.4 ft²) or a bathroom with a toilet 5.5m² (59.2 ft²) in size. From there, you can also calculate how large your ventilation fan should be to remove moisture from the room.
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Gerda-1
3 Feb 2014 07:56
Hello Paule,

thanks. I’ll take a closer look into that.
Maybe I’ll also have to check if I can have a larger fan installed.
It can’t hurt if the capacity is higher than necessary. I usually prefer a bit more anyway if it helps.

Kind regards,
Gerda
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Angelia-1
3 Feb 2014 15:05
I once lived in an apartment like that, and to be honest, the interior bathroom never really smelled good, not even with a proper exhaust fan. I was relieved when my new apartment had a bathroom with a real window. Although it was just a skylight, it was still better than relying solely on ventilation fans.
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Kurt1985-1
6 Feb 2014 20:57
Hello Gerda,
Yes, a bathroom without a window is really inconvenient. You basically have to keep the door open all the time and keep the light on while bathing. I can’t provide exact figures; you’ll need to consult a professional for that.
Good luck with it.
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Mattia-1
26 Apr 2014 08:17
I would simply have a different fan installed. Leaving the door open is helpful, but then the moisture spreads to the other rooms as well.
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Luca-1
27 Jun 2014 07:40
A bathroom without a window is something I simply cannot imagine. Even if there is a large exhaust fan, the moisture remains inside the house.