D
Deleted member 174758
It does in terms of draughts, though
Kitchen cooker hood: recirculating or with long extraction duct?
- Thread starter jacoscar
- Start date
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I have now completely ruled out the option of going into the kitchen ceiling void and the directly out over the flat roof as I would have to drill through the flashing
The other 2 options I have left are:
1) running the lenght of the utility room (there is a handy false ceiling), but then go down and towards the centre of the wall to avoid the gutter and the boiler flue
2) running partially through the utility room and go up into the flat roof using something like this
which I suspect might need to be covered with another bitumen layer (?)
The other 2 options I have left are:
1) running the lenght of the utility room (there is a handy false ceiling), but then go down and towards the centre of the wall to avoid the gutter and the boiler flue
2) running partially through the utility room and go up into the flat roof using something like this
which I suspect might need to be covered with another bitumen layer (?)
D
Deleted member 174758
Yes
There are (almost) literally a million ways to do this. You need to look at all your different levels and how much mess you want to make. Personally I'd avoid penetrating the roof and would look at coming above the flashing. Get your tape measure and investigate the different levels, see which way the joists run, be aware that you can get flat (25mm) ducting and you can run ducting up through the cavity (Google telescopic ducting) or even remove a few bricks from the inner skin to create space.
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When you say cavity, do you mean the ceiling cavity or the external wall cavity? (the wall between utility and kitchen is a cavity wall)
For telescpic ducting, you mean something like this?
https://www.screwfix.com/p/telescopic-underfloor-vent-black-220mm-x-215mm/12025
The joists over the kitchen run horizontally in this image (not drawn, the yellow line was the initial proposed run)
and I've got about 10cm between the first joist and the wall (which is where I was initially going to fit a rectangular to round adaptor)
Last edited:
Yes, that's the sort of thing, you might just need to bash a few bricks out of the way till you can get something in. This is mine, 54mm ducting just fits between the joist and the wall, I didn't actually need to go up the cavity with this one as my cupboards will hide it.
That was 2 lengths of 54x100 ducting - one up the wall, one pushed through the wall, connected into a 90° bend , at the bottom is a round to flat channel adapter. As I said earlier a bit of brickwork might need to come out to get something in.
Do you think it’s fine to cut a rectangular hole highlighted by the purple line to insert a rigid section of duct in the cavity?
View attachment 259158
The damp patch of plaster circled in green is where a hole has already been cut to allow some heating pipes to go upstairs
To the right is a party wall to the adjoining property
To the left there is a lintel over the bifold door and the window
View attachment 259158
The damp patch of plaster circled in green is where a hole has already been cut to allow some heating pipes to go upstairs
To the right is a party wall to the adjoining property
To the left there is a lintel over the bifold door and the window
So that's a choice between something which will work and something which is not really worth having (recirculation). Put the duct in, it makes sense, but make it as large and as smooth bore as possible. Don't use the corrugated flexible type, they will massively reduce the air flow.
Update; I’ve made the hole inside (house still standing) and outside
I now just have to join the duct to the two 90 degree bends; what kind of sealant do I need to join them? Would normal silicone or caulk work?
And for the outside, is it best to fit an airbrick or just a short horizontal piece of ducting and a flat grill?
I now just have to join the duct to the two 90 degree bends; what kind of sealant do I need to join them? Would normal silicone or caulk work?
And for the outside, is it best to fit an airbrick or just a short horizontal piece of ducting and a flat grill?
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