Externally vented cooker hood?

[nameisme]

Hi alll

I had a post up not long ago about getting my kirchen cooker hood external vented.

its now getting done.
I have noticed two things and would like advice on this and how to solve.

1) escape of air blowing out the ducting pipes where it's not flush connected due to wall socket being in the way. The escape of air is where the white ducking meets the black pipe at the back, it is not straight and flush as socket on wall prevents a total flush fit. What sized flue would I need? The ducking is 150mm

2) Flue needed to prevent the kitchen fumes blowing downwards towards back door and window, especially when wind blows a certain direction. So please ask the guys to bring one tomorrow rather than have to come back. Please see the vent for it above lights. The white vent.

Two other pictures are not needed but just show how they have run the ducking. The only possible option really.



Thanks all

 

[nameisme]

Wpuld this work in terms of amps etc?

Also better this one or one without a switch?

MK 13A Spur Unit

Fitted with a 13 amp fuse-link to BS1362. Flex outlet in base.

www.toolstation.com

 

[endecotp]

FFS, you can’t have the socket inaccessible behind the duct like that! Move it sideways, or something.

 

[JohnD]

(2) I suppose you could put an elbow on it to change the direction, then run a pipe further away from the window. Or just keep the window shut. Don't point it upwards because condensation and rain will then collect in it. Ducts and vents should preferably be slightly sloped so that any liquid will run outside. I favour a cowl vent which faces downwards, but the warm air then rises. Take the outside lamp off and refit it in a convenient position after you have finished the duct.

(1) You can put an electrical outlet to the side of the existing one. Leave the old backbox in place after removing the old socket and put a blanking plate over it so it is obvious what has been done. It will have the cable and a connector in it. If you have an isolating switch near the worktop, where it is visible and accessible, you do not need another switch at the flex outlet. If the worktop switch is an FCU you do not need another fuse or plug up by the duct, and a flex outlet is neater. A 5amp fuse will be suitable.

You can paint the plate to match the wall if you like.

 

[Why Not Indeed]

2) Flue needed to prevent the kitchen fumes blowing downwards towards back door and window, especially when wind blows a certain direction.

You are never going to "fix" this without going to extreme lengths, like ducting all the way to a different wall ["round the houses", as it were]. The wind will always be able to out-blow your extractor hood. Because your exhaust is going to be diffused in a much larger volume of air I am not even convinced it's an issue anyway.

 

[endecotp]

You could have had smaller boxing-in if you had used rectangular ducting.

 

[nameisme]

You could have had smaller boxing-in if you had used rectangular ducting.

I ask the company about a rectangular ducting but they said it has to be a 150mm round pipe. But surley they could have a convertor to a rectangular ducting from the point of the extractor hood all the way along ceiling and not had such a large box etc.

Please see photo.