Kitchen Hood Extractor problem

Discussion in 'Kitchen Fitters' Talk' started by Tom Clayton-Shepherd, Sep 15, 2018 at 8:58 PM.

  1. 681A22FD-549C-4BEF-94A6-BC1B004300DB.jpeg C8AFB86F-9A4A-458E-BEE8-04EBC3D6038E.jpeg 88B64E08-7537-4892-8624-86C63BF7C3C0.jpeg Hi-we moved into a house where new kitchen had been fitted in a newly built extension. The extractor kit looks poorly fitted to our inexperienced eye. The ‘pipe/tube’ looks more like a tumble dryer tube and the external vent has been fitted facing down out of the fascia rather than through the actual wall.
    We get a heck of a draft during winter and want to fix if possible.
    Want to know what options we have in terms of replacing vent with one that blocks draft better?
     
  2. KIAB

    KIAB Well-Known Member

    Usually you would use a gravity grille, it only open when hood is in use.
    And you use a rigid ducting either round, or more usual retangular (220mm x90mm normal size) with a slight fall to the outside, will allow any moisture to escape, rather than settling in duct & causing mould.
    The flexi duct in your photo would be used to join hood to ducting.

    https://www.amazon.co.uk/Manrose-gravity-diameter-ventilation-extractor/dp/B00BUQR2EU
     
  3. “Facing”
     
  4. KIAB

    KIAB Well-Known Member

    Last edited: Sep 15, 2018 at 9:19 PM
    kitfit1 and Tom Clayton-Shepherd like this.
  5. kitfit1

    kitfit1 Well-Known Member

    It looks to me as if the vent exits through your soffit ? If that is the case you could change the vent for one of the ones in the link below. When you fit it point the outlet of the vent towards the wall. It should reduce the draft.
    I'm guessing the original fitter had no room between the the height of the extractor motor and the soffit to be able to go straight through the wall. If that is not the case, then it's still an option. Flexi pipe by the way is the normal way of ducting a hood and might have been the only way if the fitter had to go through your soffit.

    https://www.screwfix.com/p/manrose-cowl-vent-white-100-x-100mm/16195
     
    Tom Clayton-Shepherd likes this.
  6. Thank you. Was going to take outer shell off tomorrow and explore the tube. Was concerned it was white as so many you see are silver.
     
  7. Weather proof
    Backdraught Shutter looks a good option! Thanks.
     
  8. KIAB

    KIAB Well-Known Member

    Your Zanussi hood (asuming it's a ZHC6234X) should be using 150mm round ducting for optimum performance, under sizing ducting can make a hood noisey.

    This works out around 220mm x90mm rectangular equivalent.
     
    Last edited: Sep 15, 2018 at 9:34 PM
  9. Excellent thank you.
     
  10. kitfit1

    kitfit1 Well-Known Member

    KIAB's link to the backdraft shutter along with changing the outside vent to the one i linked to should sort the problem out. You should fit the backdraft shutter behind the outside vent. As KIAB also said, the hood itself should already have a backdraft shutter as part of the hood.
    Depending how old the hood is KIAB, it may well only have a 100mm outlet.
     
    KIAB likes this.
  11. KIAB

    KIAB Well-Known Member

    Assuming hood is this one, or a ZHC9234X, can't the underside to be sure, would have to be a pretty old hood to be 100mm.

    https://www.zanussi.ie/kitchen/cooking/cooker-hoods/chimney-hood/zhc6234x/
     
    Tom Clayton-Shepherd likes this.
  12. kitfit1

    kitfit1 Well-Known Member

    It dosn't need to be too old KIAB. There are still plenty of hoods around that still only have 100mm vents. It's not unusual to see hoods that have got 150mm vents fitted with a reducer so that the fitter could use 100mm ducting. Completely wrong on all levels, but i have seen it often enough when ripping out a kitchen.
     
    Tom Clayton-Shepherd likes this.
  13. KIAB

    KIAB Well-Known Member

    Very true, but it's silly isn't it, hood fitted with 150mm duct & peeps reduce down to 100mm.:confused:
     
  14. kitfit1

    kitfit1 Well-Known Member

    Probably because the fitter couldn't be bothered to go and buy a 150mm core drill, or the original fit was DIY.
     
    KIAB likes this.

Share This Page