• I also investigated extractor fans a lot for my last house. UK though. I decided inline fans in the loft were the way to go. Bigger capacity, quieter from the room, can be sound insulated, and can expel in the most convenient direction. if I remember correctly hard (not concertina flex) round (not square) pipes restrict the airflow the least.

    Eg

    But they come in various diameters, abilities to shift air and noise levels. I can’t remember which one I found was best!

  • I also investigated extractor fans a lot for my last house. UK though. I decided inline fans in the loft were the way to go. Bigger capacity, quieter from the room, can be sound insulated, and can expel in the most convenient direction.

    Same. The builder we used found the most powerful inline fan he could and it was great, we had it extracting for a shower/bath on one side of a wall and the toilet on the other.

    Your standard 'UK bathroom extractor fan' is so shit, noisy and does fuck all (mainly because the fan is too small and they're cheaply made). You're better off just opening a window.

    I can’t remember which one I found was best!

    Unfortunately also this, I don't have the details of the one he found but I would go for max airflow while still reasonably quiet. Although it wasn't terrible with hindsight what I would have done was decouple it from the joints and fit more acoustic insulation around it.

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