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Airtight Extractor fan for cooker?

  • 26-04-2013 3:56pm
    #1
    Rushy Fields
    Registered Users Posts: 222 ✭✭


    Looking for advice on an extractor fan in the kitchen of my new self build. Can i bore a hole in the wall basically for my extractor fan for the cooker?
    I have MHRV installed but i am just wondering can i purchase an airtight extractor fan or is ther such a thing on the market?
    I do know there is some type of carbon filters that requires no extract/vent but i would imagine they are quiet expensive plus there is the need to change the carbon every so often.
    any advice is very welcome.


«1

Comments

  • #2
    john_cappa
    Registered Users, Registered Users 2 Posts: 1,371 ✭✭✭john_cappa


    nealger wrote: »
    Looking for advice on an extractor fan in the kitchen of my new self build. Can i bore a hole in the wall basically for my extractor fan for the cooker?
    I have MHRV installed but i am just wondering can i purchase an airtight extractor fan or is ther such a thing on the market?
    I do know there is some type of carbon filters that requires no extract/vent but i would imagine they are quiet expensive plus there is the need to change the carbon every so often.
    any advice is very welcome.

    My understanding is you cant use en extractor fan that actually extracts the air externally when you have MVHR and an airtight house. You use a fan that recirculates the air.


  • #3
    Eoghan Barra
    Closed Accounts Posts: 286 ✭✭Eoghan Barra


    john_cappa wrote: »
    My understanding is you cant use en extractor fan that actually extracts the air externally when you have MVHR and an airtight house. You use a fan that recirculates the air.

    This is correct. Having a large hole in the wall pumping warm air out of the house would defeat the purpose of airtightness and hrv, so a recirculating hood with filters is what you need. They aren't expensive (I paid in and around 120 euros). However, it will probably be necessary to place another filter over the kitchen hrv extract, as any grease not removed from the air by the hood will be sucked into the hrv extract duct otherwise.

    There has been a bit of discussion on this very subject here within the last few days: http://www.boards.ie/vbulletin/showthread.php?t=2056929580


  • #4
    fclauson
    Registered Users, Registered Users 2 Posts: 1,691 ✭✭✭fclauson


    you have a choice
    1. extract outside - have a closing baffle - accept when you are extracting you are pumping out heat (but how long do you really cook for - our stir fry took 10 mins tonight)
    2. recirculate - and have good grease filters on the extractor
    3. extract via MVHR and suffer grease in the system
    I went with option 2 - my extractor if vented to the outside could empty the house (1000 cu M) in 7 mins !!!!!


  • #5
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,141 Mod ✭✭✭✭BryanF


    fclauson wrote: »
    you have a choice
    1. extract outside - have a closing baffle - accept when you are extracting you are pumping out heat (but how long do you really cook for - our stir fry took 10 mins tonight)
    2. recirculate - and have good grease filters on the extractor
    3. extract via MVHR and suffer grease in the system
    I went with option 2 - my extractor if vented to the outside could empty the house (1000 cu M) in 7 mins !!!!!
    2. cost per year v 1.
    (given that 2 costs x)
    thanks


  • #6
    fclauson
    Registered Users, Registered Users 2 Posts: 1,691 ✭✭✭fclauson


    1 & 2 about the same price (give or take €200) - but 2 is a standard unit - simple to fit - could be replaced in x years when it fails/kitchen gets re-designed (heaven for bid :mad:) or what ever
    1 has is a bit of a self build effort to get a good motorised baffle and make it work


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  • #7
    Eoghan Barra
    Closed Accounts Posts: 286 ✭✭Eoghan Barra


    fclauson wrote: »
    you have a choice
    1. extract outside - have a closing baffle - accept when you are extracting you are pumping out heat (but how long do you really cook for - our stir fry took 10 mins tonight)
    2. recirculate - and have good grease filters on the extractor
    3. extract via MVHR and suffer grease in the system
    I went with option 2 - my extractor if vented to the outside could empty the house (1000 cu M) in 7 mins !!!!!

    fclauson, can I ask what type of grease filters you used on the hrv extractor, and where did you get them?


  • #8
    john_cappa
    Registered Users, Registered Users 2 Posts: 1,371 ✭✭✭john_cappa


    X2 on above.


  • #9
    fclauson
    Registered Users, Registered Users 2 Posts: 1,691 ✭✭✭fclauson


    you all miss understood - no grease filter on HRV (which is a good 10ft from hob) just on the recirc extractor


  • #10
    Eoghan Barra
    Closed Accounts Posts: 286 ✭✭Eoghan Barra


    fclauson wrote: »
    you all miss understood - no grease filter on HRV (which is a good 10ft from hob) just on the recirc extractor

    Aren't you concerned about grease build up in the hrv duct? sas reported that the filter he put over the hrv kitchen intake was 'manky' with grease (his is 10ft away too; mine is only 4-5ft).


  • #11
    fclauson
    Registered Users, Registered Users 2 Posts: 1,691 ✭✭✭fclauson


    yes - ..... its on the "to do list" -along with a lot of other things !!


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  • #12
    Eoghan Barra
    Closed Accounts Posts: 286 ✭✭Eoghan Barra


    fclauson wrote: »
    yes - ..... its on the "to do list" -along with a lot of other things !!

    I know what you mean!

    Do you have any idea where suitable filters can be obtained?


  • #13
    Sandman777
    Registered Users Posts: 33 ✭Sandman777


    fclauson wrote: »
    you have a choice
    1. extract outside - have a closing baffle - accept when you are extracting you are pumping out heat (but how long do you really cook for - our stir fry took 10 mins tonight)
    2. recirculate - and have good grease filters on the extractor
    3. extract via MVHR and suffer grease in the system
    I went with option 2 - my extractor if vented to the outside could empty the house (1000 cu M) in 7 mins !!!!!

    Hi

    Im currently in the same position as OP! I am thinking about extracting from cooker directly to outside and having a mechanical damper that opens/closes when extractor is switched on/off!!

    I know i am basically sucking heat out of the house while its out but i am a bit wary of filtering and recirculating the air as i dont want the MHRV sucking any excess gunk into the system!! MHRV extract approx 2.5 m from cooker extractor!

    I basically dont know what option to go for and any advice appreciated!!

    S


  • #14
    gooseygander
    Registered Users Posts: 317 ✭✭gooseygander


    Sandman777 wrote: »
    Hi

    Im currently in the same position as OP! I am thinking about extracting from cooker directly to outside and having a mechanical damper that opens/closes when extractor is switched on/off!!

    I know i am basically sucking heat out of the house while its out but i am a bit wary of filtering and recirculating the air as i dont want the MHRV sucking any excess gunk into the system!! MHRV extract approx 2.5 m from cooker extractor!

    I basically dont know what option to go for and any advice appreciated!!

    S
    Hi sandman and all others that may have opinions, what system did you go form in the end for your cookerhood. We are at that stage now of our build and I also am wondering whether to core a hole in the wall for the cooker extractor/vent. My mhrv extract duct is positioned about 8foot from where cooker is but I am still leaning towards the hole in the wall. Any advice on what size core or where one might get a damper to place on same. All opinions welcome especially from anybody who has gone down this road before me and how they are getting on with their system. Many thanks


  • #15
    BarneyMc
    Registered Users, Registered Users 2 Posts: 1,504 ✭✭✭BarneyMc


    I'm interested in this also as I've the same dilemma.

    I'm also planning on putting in a central vacuum system but reading this thread I'm having second thoughts as it will also suck the warm air from my house (unit would sit in the garage)!!


  • #16
    gooseygander
    Registered Users Posts: 317 ✭✭gooseygander


    BarneyMc wrote: »
    I'm interested in this also as I've the same dilemma.

    I'm also planning on putting in a central vacuum system but reading this thread I'm having second thoughts as it will also suck the warm air from my house (unit would sit in the garage)!!

    Hi barney, my slab and walls are being cored tomorrow for plumbing services, I am going to go with hole in wall for extractor also, thinking 4 inch hole and get a baffle or damper for it, don't want hassle with grease in mhrv system or cooking smells lingering. Or even hassle and expense of charcoal extractor which needs regular filter change and usually are crap anyway, am I mad or making a mistake ???, what you think


  • #17
    gooseygander
    Registered Users Posts: 317 ✭✭gooseygander


    Ment to say I opted against vacuum plan as I was told it sucks heat and more important its brutal for air tightness plans, but I did not study the system in debt


  • #18
    BarneyMc
    Registered Users, Registered Users 2 Posts: 1,504 ✭✭✭BarneyMc


    gooseygander wrote: »
    Hi barney, my slab and walls are being cored tomorrow for plumbing services, I am going to go with hole in wall for extractor also, thinking 4 inch hole and get a baffle or damper for it, don't want hassle with grease in mhrv system or cooking smells lingering. Or even hassle and expense of charcoal extractor which needs regular filter change and usually are crap anyway, am I mad or making a mistake ???, what you think

    I really don't know goosey but if I had to do it tomorrow I would probably do the same. There's a lot of airtight houses out there so surely there must be a device that suits your needs (baffle/damper).


  • #19
    BarneyMc
    Registered Users, Registered Users 2 Posts: 1,504 ✭✭✭BarneyMc


    gooseygander wrote: »
    Ment to say I opted against vacuum plan as I was told it sucks heat and more important its brutal for air tightness plans, but I did not study the system in debt

    Yeah the saleman was not too convincing when I brought this up... will re-consider.


  • #20
    gooseygander
    Registered Users Posts: 317 ✭✭gooseygander


    well that's that, hole to outside now in wall where extractor will be, now where to get damper or closing baffle to fit in 4 inch pipe ????, any ideas or advice.


  • #21
    nailer8
    Registered Users, Registered Users 2 Posts: 220 ✭✭nailer8


    I was told by the guy selling the MHRV system he would supply an electric baffle/valve for the extract pipe which you wire to the extractor to open when its in use.
    I wouldn't be too concerned re the heat being sucked out, you hardly cook that much and it is probably compensated by the heat generated by the cooking.


    Alternative is the charcoal filter which i might go for too, had one in an apartment before never caused any hassle and the filters are cheap to replace.


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  • #22
    gooseygander
    Registered Users Posts: 317 ✭✭gooseygander


    nailer8 wrote: »
    I was told by the guy selling the MHRV system he would supply an electric baffle/valve for the extract pipe which you wire to the extractor to open when its in use.
    I wouldn't be too concerned re the heat being sucked out, you hardly cook that much and it is probably compensated by the heat generated by the cooking.


    Alternative is the charcoal filter which i might go for too, had one in an apartment before never caused any hassle and the filters are cheap to replace.
    Thanks nailer8, any chance of your mhrv mans contact details so I can enquire about his damper, by pm is safest, many thanks


  • #23
    nailer8
    Registered Users, Registered Users 2 Posts: 220 ✭✭nailer8


    Done. Good luck.


  • #24
    BarneyMc
    Registered Users, Registered Users 2 Posts: 1,504 ✭✭✭BarneyMc


    nailer8 wrote: »
    I was told by the guy selling the MHRV system he would supply an electric baffle/valve for the extract pipe which you wire to the extractor to open when its in use.
    I wouldn't be too concerned re the heat being sucked out, you hardly cook that much and it is probably compensated by the heat generated by the cooking.


    Alternative is the charcoal filter which i might go for too, had one in an apartment before never caused any hassle and the filters are cheap to replace.

    Is the electric baffle/value airtight?

    Spoke with someone today who opted for the carbon filter instead of full extraction and he's very happy with it.


  • #25
    gooseygander
    Registered Users Posts: 317 ✭✭gooseygander


    BarneyMc wrote: »
    Is the electric baffle/value airtight?

    Spoke with someone today who opted for the carbon filter instead of full extraction and he's very happy with it.

    Just ordered a battic back draft damper online, I was finding them very hard to source locally. It fits in a four inch duct and looks ideal. It work with the aid of a fabric within the duct which closes in on itself when wind blows from outside and opens out when extractor is turned on. No running costs or maintenance. I was a bit worried the butterfly type damper might seize up within the duct over time. I'll give you update on it when it arrives. I don't like or trust carbon filters but that's just me, best of luck


  • #26
    Sandman777
    Registered Users Posts: 33 ✭Sandman777


    gooseygander wrote: »
    Hi sandman and all others that may have opinions, what system did you go form in the end for your cookerhood. We are at that stage now of our build and I also am wondering whether to core a hole in the wall for the cooker extractor/vent. My mhrv extract duct is positioned about 8foot from where cooker is but I am still leaning towards the hole in the wall. Any advice on what size core or where one might get a damper to place on same. All opinions welcome especially from anybody who has gone down this road before me and how they are getting on with their system. Many thanks

    Hi Goosey

    Ive decided to extract directly to outside. Altho i have a very well sealed airtight house i was not happy to recirculate filtered plus the heat loss while the extractor is switched on will be small as heat produced from cooking more or less balances out the losses.

    I havent connected it up yet as i am looking for a suitable baffle for the extract duct on the outside . There is also a baffle on the extractor fan itself over the cooker that closes when not in use.


  • #27
    BarneyMc
    Registered Users, Registered Users 2 Posts: 1,504 ✭✭✭BarneyMc


    gooseygander wrote: »
    Just ordered a battic back draft damper online, I was finding them very hard to source locally. It fits in a four inch duct and looks ideal. It work with the aid of a fabric within the duct which closes in on itself when wind blows from outside and opens out when extractor is turned on. No running costs or maintenance.

    Has this arrived yet and if so wha do you think?


  • #28
    gooseygander
    Registered Users Posts: 317 ✭✭gooseygander


    Hi barney, yes it has arrived but I have not installed it yet as plastering is currently being done and I will install it when its finished. It fits very snuggly inside a 4 inch duct and the fabric in it is very flimsy and light so I want to ensure to duct is clean and free of any debris that might hinder its working when I fit it. Hope that helps you a bit but is it any good at what its designed for ?, don't know yet.


  • #29
    PROJECT K
    Registered Users Posts: 192 ✭✭PROJECT K


    heard great reports about ionising units see link below, but very expensive (between 1500 and 2000!!!:eek:) I have experience of charcoal recirculating hoods which work fine and thats what i will go with now, once the ionising units become more affordable i will switch to one of them...couldnt bear punching any more holes in the walls after the effort to get them airtight!!!

    http://www -snip-

    PK


  • #30
    Curious Geroge
    Registered Users, Registered Users 2 Posts: 1,014 ✭✭✭Curious Geroge


    Any feedback on the battic back draft dampers?


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  • #31
    nailer8
    Registered Users, Registered Users 2 Posts: 220 ✭✭nailer8


    PROJECT K wrote: »
    heard great reports about ionising units see link below, but very expensive (between 1500 and 2000!!!:eek:) I have experience of charcoal recirculating hoods which work fine and that's what i will go with now, once the ionising units become more affordable i will switch to one of them...couldn't bear punching any more holes in the walls after the effort to get them airtight!!!

    I also scrapped the vented extractor plan. It was causing all sorts of problems and decided to go with a recirculating one. Never heard of Ionising units before. Has anybody actually fitted one?
    Anyone know where there are impartial reviews available, obviously the manufacturers claim they will change your life but nothing new there.

    One word of warning for those planning on fitting electric dampers in the duct work that came up in my investigations. The electric dampers take 45-60sec to open. If you wire them to the fan on the extractor the air will have nowhere to go until its open. Ideally you need a delay timer or wire the fan to the microswitch in the damper which will only activate the fan once the damper is fully open. This may not be that simple on fancy remote control extractors.


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