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Ventilation: MVHR bathroom vent location

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    • CommentAuthormorsing
    • CommentTimeSep 17th 2019
     
    Hi,

    We're having a new bathroom installed in a 1970s house. Everytime we have someone from the bathroom company coming out, they start talking about installing a fan inside the shower. When I point out the ventilation system, which vent sits in the corner by the window on the other side of the bathroom to the door and shower, they say "Oh right, well we can move that to sit inside the shower.".

    When I installed this, I am pretty sure I found documentation that I based the vent location on, but now I can't find it again.

    So in a bathroom with a window and shower, where should the vent be?

    Thanks
    •  
      CommentAuthordjh
    • CommentTimeSep 17th 2019
     
    The MVHR extract in our ensuite is inside our shower*, which is open to the room (i.e. no door on shower enclosure and open space above the enclosure). Normally it is fine but occasionally I feel a cool draft which I normally don't want. When the temperature in the house gets down to 20°C I tend to turn the MVHR down whilst I shower.

    So if I did it again, I'd put the extract vent outside the shower. If the shower was fully enclosed I might think differently, I don't know.

    * Actually it's high on the wall above the shower enclosure.
    • CommentAuthorGreenPaddy
    • CommentTimeSep 18th 2019
     
    When I design the MVHR systems, I tend to put the extract vent in or close to the shower, however, more important is keeping the extract away from the bathroom door, so you get air washing through the room. JDH makes a good point about a walk-in shower, and the slight draft, from having the extract "behind" the person showering (note for future).

    That said, bathrooms aren't usually large rooms, so the extract is never far from the shower. Your installers are probably right, but how far is the existing extract from the shower, and is the shower open around the top (ie glass screen to 2m, or closed floor to ceiling)?
    • CommentAuthormorsing
    • CommentTimeSep 18th 2019
     
    The bathroom is 3.5m long, with door and open shower at one end. The shower has a curtain to one side, and a wall to the other, with a 20cm gap top the ceiling.
    The shower entry is facing the door, so not towards the far side of the room, but the wall with the gap is.

    The vent in reality is probably less than 2m from the shower.

    My main concern with a vent inside the shower, apart from draft, is also over-sensitivity. It needs to vent the whole room, not just the shower. If it was inside the shower, it would also be right next to the door, and there would be no flow through the room.

    Thanks
    •  
      CommentAuthordjh
    • CommentTimeSep 18th 2019
     
    Posted By: morsingIf it was inside the shower, it would also be right next to the door, and there would be no flow through the room.

    I agree with GreenPaddy that crossflow is more important. With continuous ventilation, the shower will dry out quickly enough. As long as its designed to get wet, it'll be fine.
    • CommentAuthormorsing
    • CommentTimeSep 19th 2019
     
    Thanks for the input - I can stand my ground now.

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