Ducting extractor hob on a kitchen island to outside wall

[CJER]

10 minutes ago, saveasteading said:

Hadn't thought of that.  yes we should do that. It will restrict flow to some extent but we must try.  But it would be best if the appliance has an automatic shutter, which is what I meant in your second query.

 

No, in terms of having a draughty hole in the room.

 

Wow. You won't get much kit for that.

Is that simply a fan unit with heat exchanger and no ducting? Ive seen them and expect that the expelled air is drawn straight back in and the intake air is sucked straight back out.

I think a back draft damper/non return valve is quite normal for extractors as it will open when the air is pulled down and close when off?

 

from what our architect explained the MVHR venti fluxo stops heat loss, again its quite technical to me but have a look at the venti fluxo website.

 

its expensive but apparently a very good piece of kit, i still dont quite understand it!

[JohnMo]

I wouldn't bother with the MVHR unit you propose but install one of these in you kitchen, utility and bathrooms

https://ebay.us/m/ROuJpj

 

If your dry room windows have trickle vents replace with these

https://www.shop24glasgow.co.uk/en/search?controller=search&s=AERECO

 

If they don't have install something like this

https://www.heatrecoverydirect.com/products/s-p-em-hy-humidity-controlled-air-inlet-install-100mm?variant=49866952540487&country=GB&currency=GBP&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gad_source=1&gad_campaignid=22034401125&gbraid=0AAAAApOCirjcUNbeNqKiRFAf35BF6ArLV&gclid=CjwKCAjw687NBhB4EiwAQ645dsrORFKnBkTQ2Q9IRY8v-_DuJgE6HbJuPLAFz-T3LlMUipNQsgvICRoCNUwQAvD_BwE

 

Then you will a humidity sensing ventilation system 

[Nickfromwales]

6 hours ago, CJER said:

Hi Nick,

 

Appreciate your response, it has been a minefield, this is a drop in the ocean in terms of the advice we've received for our extension and ground floor renovation, many 3am nights researching things i've never known about, dont get me started on foundations and footings 😅

 

I'm thinking my best approach moving forward would be to get the hob ducted out as best practise to remove as much smell and cooking from the room if we have the opportunity to do so, and to then have the log burner installed with its own air supply (4.9kw wood burning stove), it's more of a feature and crutch to using heating than it is a necessity to warm the house full time.

 

We have a survey next week with the log burner supplier so perhaps in the space and looking at what it is we're doing in the flesh he'll be able to advise us further, albeit, I hope it wont be a case of...lets install, pay ££££, oh its failed spillage test, no cert!

 

Why is it the an MVHR isn't good, as in my understanding its also good to generally take old air and replace with new air, and if the log burner or hob did need more air, it can take from this...or does it not work like that?

I’ve been very busy sorry, and it’s a complex situation so I’ve not bothered giving you bits of answers in my spare time as it would be of little value.

 

I’ll reply asap, and I suggest you hold off doing anything until you fully understand all the options, actions and consequences.

 

On 11/03/2026 at 07:50, CJER said:

We have been advised its best to duct the hob fumes/moisture out of the house, rather than recirculating, due to also having a wood log burner in the room and a MVHR, but have seen a lot of reading around the best way to do it.

 

Whoever is advising you currently needs to be shown the door though.

[Mr Punter]

Put the hob on an outside wall run and duct straight through the wall.  I have an externally mounted extract so I can get lots of extraction of cooking smells and smoke with very little noise.  It is what nearly all commercial kitchens have.  Not so important if all you do is steam a few veg and order in takeaways.