Cooker Hood Ducting

[AnneKipankitoo]

We are finally getting our kitchen done but all the appliances we picked are not available any more.
Husband is looking at cooker hoods.
He had found one but we do have to add ducting.
The ceiling is higher than we first thought it was going to be and the exit point is offset as there is an original beam at the planned exit point so we will probably need a kink in it.

Any advice ?

Put a kink in it or exit lower down the wall?

I'm assuming you can't just go out through an exterior wall? We recently renovated and changed the layout to accommodate going out the wall. We too have very high ceilings, and I didn't want a massive exhaust in the middle dominating the room.

There are the downflow options where it sucks the air downwards instead. We found 1 which needs ducting, and ones with a charcoal absorbent thing which needs changing.
Any brands you are thinking of? Miele have an outlet store and the stock changes daily.
MieleOutletPricelist.pdf

We have a cooker hood that is not ducted. I just wash the filters in hot soapy water every 6 weeks or so.

There is an outlet to an outside wall high up

We have one too. It has washable grease traps (dishwasher)and charcoal filters that need to be replaced. They aren’t cheap.

We found that a traditional extractor pulled air back down the chimneys making the house smell sooty.

There is an outlet to an outside wall high up
Apologies. For some reason I thought you were adding it above an island! I clearly need more coffee today 😀

My husband was getting into a panic about it but it looks like it is going to be ok.

Thanks everyone.

Sorry, another question related to this. The builder has been in and set things up but the vent / ducting he has used is of a narrower specification than the cooker hood requires. 120mm is specified by Neff. It also looks like tumble dryer stuff.
The ducting follows a tricky route too as a beam was in the way.
It has also been boxed in but the gap that he has left is too small to access the adapter thing.
I am concerned that this ducting will be a fire hazard.
Any thoughts?

To update any one that might be interested: got ducting and adapters and a vent. My husband is still to put it into a pipe that will be in and behind the stainless steel chimney hood.

The builder just left a hole in the wall. No vent.

If the ducting is more narrow than the manufacturer specifies it can hugely increase the noise of the cooker hood when it's on. I had this issue as the builders didn't read the instructions and put smaller ducting and external vent tile - the issue was solved when they re-did it to the manufacturer specs.

If in doubt, you can also ask the manufacturers what their recommended maximum run is. I remember when I asked the length of the run was reduced by the number of 90 degree bends. EG the max run might be 5 metres straight, but if there's one 90 degree bend then it's reduced to 3 metres - something like that.

Also, if the ducting passes via any cold points (eg through a cold loft space) then it's recommended to have insulated ducting to avoid condensation forming.

True @AlmostCutMyHairToday

I live in an old house so a beam was in the way so the ducting does not go straight out.
We could not find the width of ducting that the cooker hood manufacturer specified.

Correct ducting is essential. The manufacturer will have a technicial advice line to come up with a solution.
You can get semi rigid ducting in 100,125,150 and 200mm at least as I have sourced it before, although the larger sizes may have to be ordered online.
If in doubt go bigger rather than smaller.
Ducting is one of those things that's very very commonly bodged as it's easier and no one really checks before the bill is paid (or even afterwards)

We had problems getting 125.
The external hole was also cut too small to take a 125 and the working space externally was much reduced. The hole opens on an external wall but there is a new roof of our extension next to it. There is no way my husband would have got in the space with a core drill?( can’t remember if that is the right name) I can post another photo later today or tomorrow. I have posted 3.
Unfortunately we have had to make compromises…We are not happy about it.
No one seems to do things right these days. It is incredibly frustrating.

I will try and add pics

It is finally on the wall.