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Internal room extractor fan - cold air coming in

  • 06-01-2022 2:36am
    Registered Users Posts: 141 ✭✭

    Not sure if this is the right forum but here goes...

    I have a small internal bathroom/toilet (single story house) with an extractor fan connected to a flexible hose in the attic that kinda goes as far as the eaves as far as I can tell. But the room is very cold especially recently given the cold weather, so I'm guessing that there is cold air coming in through the hose/fan. I don't see any filter/flap to stop the cold air coming in at either end. Google tells me I need some kind of backdraft flap on the fan or maybe some kind of vent at the other end to only allow air out and not in but I've not been able to find a definite answer...

    Any thoughts or ideas on what I need to do?