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Ventilation: Kitchen extract within MVHR?

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    Posted By: wookeyRight, but I don't like cooker hoods (noisy, 90% pointless). We have one but it has never been used - in fact I'm not sure if it works (I think it does but the bulb doesn't). VTW does not want to turn one on every time she cooks, and neither do I.

    But we do now have MVHR, at least in winter. And over a decade or so lard does slowly collect in the corners of the room, so some will now end up in the vent pipe. A filter in the valve seems like a good idea (Assuming that loss of efficiency is not too high).


    I've never understood people's resistance to using cooker hoods. We use ours pretty religiously and I wouldn't want the grease that I wipe out of the Berbel/washed out of our old metal grid filter distributed over the kitchen. I've rented/lived in houses where people don't use hoods and our own house doesn't get that layer of grease on top of cupboards etc that I see there.

    We've had our hob/hood in use for 4 months now (wow. time passes) and the Berbel seems very effective at stopping grease and steam. It's always hard to judge effectiveness on smells as theres no 'control' case - it certainly doesn't completely stop food smells leaving the cooking area but not are they a problem (but obviously that also depends on what you cook).

    The island hood is visually intrusive in the kitchen but that's probably why it's effective - I don't believe a flush ceiling mounted hood would work as well due to the distance from hob to hood.

    Our MVHR is linked to the Berbel hood so that it goes into 'boost' when the hood is on (with an overrun)
    • CommentAuthorwookey
    • CommentTimeApr 5th 2016
     
    It's clean a bit of grease from on top of cupboards once every decade or so vs use 150W every day for some time - let's say 20 mins. That's 19 kWh/yr. Or 190 in exchange for the decadal cleaning. £27. Just seems like a waste of energy.

    More significantly the ones I've owned have always made a terrific racket, which is very offputting, and exhaust warm air to outside, which is presumably a great deal more energy loss in winter than just the fan-running noted above. I know that's the main reason my missus would never turn one on.

    I guess ones diet and cooking style makes a difference too. Mostly veg presumably makes less lard than a lot of steak, and mostly frying makes more than other cooking methods.

    And yes I know an MVHR uses energy too. Ours runs 8hrs/day winter-only so far which seems to be more than enough ventilation. That's 11kWH/yr/
    • CommentAuthormikrt
    • CommentTimeJun 8th 2016
     
    Has anyone any experience of this item, a COMPAIR flow round 125? It seems to be a simpler & cheaper version of the Berbel previously mentioned. Am seriously considering buying one.

    https://www.youtube.com/watch?v=2bORG4Rmo2s
    • CommentAuthormikrt
    • CommentTimeJun 9th 2016
     
    Actually.... I've just watched the video PROPERLY, and it seems to need a nudge to close, so maybe not.
  5.  
    I think you need some German to make sense of it! The video's actually a comparison between a faulty ('defecter') and new unit, so it's only the faulty one that needs nudging. A properly functioning one seems to open and close by itself according to the setting of the extractor.
    • CommentAuthordpmiller
    • CommentTimeApr 18th 2017
     
    Late to this one but giving it some thought for our forthcoming selfbuild. We've a large kitchen/living room and will be having MVHR, but I'm trying to work up a satisfactory way of doing so with both a gas cooker and a small boiler stove to consider.
    Stove won't be DibT but will be external air
    MVHR of choice is Beam, so it'll have a nice "fault" light in the room.

    I'm thinking a standard extract hood but with the duct Tee'd into the MVHR via a motorised damper and with a gravity flap on the wall outlet would deal with the airside, powering a relay from the hood's fan power to put the MVHR into boost and close the damper.
    So the room's normal extract *and" occasional greasy coolking can both go through the hood without gunging up the HE.
    Is it likely I'll be able to get enough positive pressure in boost to allow this?
    • CommentAuthortony
    • CommentTimeApr 18th 2017
     
    Seperate cooker extract for me, never let the two streams mix and ensure fail safe, i.e. no tee.
  8.  
    18 months of using our recirculating Berbel and not missing an external extract cooker hood. No real issues with cooking smells or excess moisture (MVHR goes to boost when the hood is on). I thought we'd overheat when cooking a big meal but even at Christmas with two ovens, warming drawer and every hob burner on wasn't an issue. Opened the window for 5 minutes or so I think but would have had to do that in our old house.


    We have an induction hob, which probably helps as far less waste heat produced than cooking on gas. Much more controllable and powerful as well - big advantages over gas in my opinion. Completely reliable/consistent simmer is great as well - I put a chicken carcass on to make stock this morning. Onto boost for a very short time to bring to the boil, then turn down to simmer and set timer to switch off after 1 hour. Constant simmer, didn't boil over once.

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