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Kitchen extractor condensation

  • 26-04-2019 3:28pm
    #1
    padyjoe
    Registered Users, Registered Users 2 Posts: 1,195 ✭✭✭


    I've noticed that my kitchen cooker hood, even if it's on the highest setting and the things get really steamy, it starts dripping with condensation.

    It's rated around 400m3 per hour (Belling 60cm wide). When moderate cooking is going on, it's perfect. The main problem is what I reckon is the length of the ducting. I have a 2m long section with a 90 degree elbow, starting from the hood, at 150mm then it's reduced to a sewer pipe size, 110mm, length of 2.5m, then 90 degree elbow, drops down 1m, another elbow and a bit more to the outside.
    In a perfect scenario the ducting shouldn't be more than 5m long.

    What would be a solution in this case? If I get more powerful extractor, I think it'll put more pressure on the motor.
    Would an inline fan help with the long ducting?
    Thanks!


Comments

  • #2
    The Red Ace
    Registered Users, Registered Users 2 Posts: 1,388 ✭✭✭The Red Ace


    First thing to check is the free operation of the flaps on the wall outside, if you are venting on a westward facing wall the air pressure is often greater than what the normal fan can provide to keep the flaps open but if you are good at diy try making a box with vent pointing downwards attached to wall to cover over the flaps. otherwise I think you would need a twin motor extractor


  • #3
    Borzoi
    Registered Users, Registered Users 2 Posts: 2,874 ✭✭✭Borzoi


    The equivalent length of a long bend is approx 15mtr of straight duct. You have 3 in total, 2 of whom are undersized so probably count double, 30mtr each. Adding it up is approx 85mtr. plus the terminal grille at the end.

    If you can improve the ducting, that would be a better solution than adding more fan power. I don't have a ductulator to hand but can check Monday on optimal sizes.

    bTW are the filters clean or clogged with grease?


  • #4
    padyjoe
    Registered Users, Registered Users 2 Posts: 1,195 ✭✭✭padyjoe


    Thank you to both!

    Flaps outside should be ok, it's in the neighbour's garden, never seen it but can hear the wind playing with it. Which hoods are twin motors?

    Improve ducting? Can't make it shorter, unless I punch a hole into the front wall. Can go to 150mm all the way though, it still look like this: 1m up, 90d bend, 4m horizontal straight, 90d bend, 1m down, this section parallel to wall, 90d bend which turned 90d in order to go outside and 0.5m duct. Hope I'm clear enough in explaining this.
    The hood is couple of months old, the metal mesh is clear. No other filters fitted. There's a slight inclination to the wall after the 1st elbow, didn't want to go too steep on it.


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