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Wind noise in chimney

  • 21-11-2013 12:52pm
    #1
    Registered Users Posts: 67 ✭✭


    I am the proud owner of a newly installed WS Aoife Stove. It's great, it has been very nicely installed and I love it - there's just one thing...the noise in the chimney. This noise did not exist when we had the open fireplace.

    On Friday the lads removed and opened up the fireplace, put in new lintels, the scamolex boards etc and then came back on Monday to fit the stove/flue liner etc. Over the weekend it sounded like motorbikes were going by the house, presumably from the wind whistling down the chimney. I was hopeful come Monday when the flue liner and chimney hat were fitted that this noise would go away and certainly the buzzing sound has stopped but there is significant wind noise.

    the exact components I have are:

    FL/125/5 Clamp Collar for 125mm Flexi
    FL/125/7 Chimney Hat for 125mm diameter flexi
    FL/125/8 Flue Joiner for 125mm diameter flexi TK/0309/09
    FL/SF/125/10-316 9 Meter Pack Flexi Flue for Solid Fuel

    Is the problem the chimney hat? I've heard there are H shaped chimney hats - would they be better?

    I believe it's downdraught but am not 100% sure.

    thanks
    Wishbone.


Comments

  • Registered Users, Registered Users 2 Posts: 439 ✭✭North West


    Hi Wishbone
    Did they put insulation in between flexible flue and flues were already there ?. If not that could be causing some of the noise.
    NW


  • Registered Users Posts: 67 ✭✭wishbone


    Hi North West

    Thanks for your reply
    Is vermiculite insulation? I think so, if so there was 300 litres of it used.
    Apparently we had a 9.5 inch chimney flue.
    Wishbone


  • Registered Users Posts: 25 fredgalway


    Hi wishbone You may have a leak between flexi and stove pipe. Why did you use 125mm flexi, should be 150mm minimun


  • Registered Users Posts: 67 ✭✭wishbone


    fredgalway wrote: »
    Hi wishbone You may have a leak between flexi and stove pipe. Why did you use 125mm flexi, should be 150mm minimun

    Not sure. Will get them to check when they replace the skamolex boards which we foolishly painted with the wrong paint and now need to be replaced as the paint smokes! GRRRR.

    Thanks for your reply.
    Wishbone


  • Registered Users Posts: 67 ✭✭wishbone


    Hi all,

    I'm still looking for advice.
    The stove crowd have changed the cowl twice, once with an anti-downdraught cowl and now with an H shaped cowl. Despite this there is still wind coming down the chimney. When I light the stove initially on a windy day which is every day these days, with briquettes the stove fills with smoke and I need to open the door slightly to get it going, by opening the door the smoke goes up the chimney easier it would seem. The noise of the wind is quite loud. On non-windy days the stove if perfect. The noise is coming specifically it would seem from the top of the door, near the airwash vent. I checked that there is no gap with paper and also I presume if there was a gap the briquette smoke would be coming into the room but there isn't even a sniff of briquette with the door closed.

    I rang the stove company and they suggested I contacted Mi-flue I believe they're called and they suggested putting a vent in the room. The room itself does not have one as we built an extension onto it, but it's not a sealed room as the extension has a vent. She said there was no way to prove a vent would work beforehand...even with opening all doors/windows...which has no impact.

    Any other thoughts?
    Thanks.
    Wishbone


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  • Hosted Moderators Posts: 3,496 ✭✭✭DGOBS


    Opening a window would prove a vent!


  • Registered Users Posts: 67 ✭✭wishbone


    DGOBS wrote: »
    Opening a window would prove a vent!
    Thanks so based on opening the windows and doors having no impact would that mean that there's no point in getting one and therefore the problem is something else?


  • Hosted Moderators Posts: 3,496 ✭✭✭DGOBS


    All open flues appliances should have a fixed vent to supply combustion air to it, but in answer, if you cracked open a window in the room and it didm't resolve the issue, then no, a vent is only providing air same as the window


  • Registered Users, Registered Users 2 Posts: 439 ✭✭North West


    Hi Wishbone
    What height is your chimney above ridge board. Are there any obstructions around house like tall trees or buildings. Something like these could cause a type of down draught as the wind blows from a certain position. post photo of chimney outside and any building trees or obsticles etc.
    NW


  • Closed Accounts Posts: 4,677 ✭✭✭shane0007


    North West wrote: »
    Hi Wishbone
    What height is your chimney above ridge board. Are there any obstructions around house like tall trees or buildings. Something like these could cause a type of down draught as the wind blows from a certain position. post photo of chimney outside and any building trees or obsticles etc.
    NW

    I would be looking also along this line. Make sure the flue terminal/termination point is outside the negative pressure zone surrounding your roof.


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  • Registered Users Posts: 67 ✭✭wishbone


    There is a tall tree at the end of the garden, about 10 metres away I would guess. You can see the chimney in the attached pic - I would say the tree at the end of the garden is about the same height as the chimney. If it is higher, does it mean the chimney has to be extended? Is there no cowl that can get over this pressure issue?

    Thanks again for all your comments.8ndd.jpg


  • Moderators, Home & Garden Moderators Posts: 6,331 Mod ✭✭✭✭Wearb


    Chase that crow away and see if it makes any difference :)

    Please follow site and charter rules. "Resistance is futile"



  • Registered Users Posts: 67 ✭✭wishbone


    Wearb wrote: »
    Chase that crow away and see if it makes any difference :)
    Opportunistic crow! :D


  • Closed Accounts Posts: 4,677 ✭✭✭shane0007


    Was a smoke test carried out on the flue & checked outside to ensure the smoke is only omitted from that flue?


  • Registered Users Posts: 67 ✭✭wishbone


    shane0007 wrote: »
    Was a smoke test carried out on the flue & checked outside to ensure the smoke is only omitted from that flue?
    I don't know for sure.
    I can do that I expect, do you wonder if it's coming out another chimney pot?


  • Closed Accounts Posts: 4,677 ✭✭✭shane0007


    wishbone wrote: »
    I don't know for sure.
    I can do that I expect, do you wonder if it's coming out another chimney pot?

    4 flues together could well have deterioration into eachother.
    A Flue Flow Test would be a must anyhow & as part of that test, the terminals would be checked for only one omitting smoke.
    Just a thought.....


  • Registered Users Posts: 118 ✭✭rayfitzharris


    wishbone wrote: »
    I don't know for sure.
    I can do that I expect, do you wonder if it's coming out another chimney pot?

    Hi wishbone, didn't you say when you open the stove door a little that the smoke flies up the chimney fine?

    Have you the air vent(s) open a bit on the stove? It sounds like if it can get some air from the room it should work ok.

    Btw this won't cure wind noise but should improve the smoking up or "draw" problem. I often hear some wind noise when the fire is not lighting but shutting up the vents and air wash can help that too.


  • Registered Users Posts: 67 ✭✭wishbone


    Just to provide an update. They have come back and have done the smoke test etc. They swapped in another stove to see if that had any impact, it didn't so they put back in my original. So it wasn't the stove., and then replaced the cowl again this time with an anti updraught (rather than downdraught) cowl and the result is that the constant wind noise is gone, there's a bit alright but it is muffled and can really now only be heard on very windy days. In addition even when very windy it is not half as loud as before.
    Anyway just thought I'd let you know how things went....
    Wishbone


  • Moderators, Home & Garden Moderators Posts: 6,331 Mod ✭✭✭✭Wearb


    Did they replace the cowl and stove at the same time, if so then you don't know which was causing the problem. Or did replacing one help and then the other helped some more?

    Please follow site and charter rules. "Resistance is futile"



  • Registered Users Posts: 67 ✭✭wishbone


    Hi Wearb

    They swapped in another stove to see if that had any impact, it didn't so they put back in my original. So it wasn't the stove.


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  • Moderators, Home & Garden Moderators Posts: 6,331 Mod ✭✭✭✭Wearb


    wishbone wrote: »
    Hi Wearb

    They swapped in another stove to see if that had any impact, it didn't so they put back in my original. So it wasn't the stove.

    Thanks. Very important to mention that. Otherwise readers of this thread might be misinformed.

    Please follow site and charter rules. "Resistance is futile"



  • Registered Users Posts: 11 sayn


    Hi, I know it is a very old post, but I have the same problem after the installation of Vitae 9kw built-in stove. Do you know that is the model of the anti-updraught cowl that has solved your issue? Thank you.



  • Registered Users Posts: 11 sayn


    I am googling anti-updraught cowl, but all I get is about anti-downdraught cowl



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