Another cooker extractor into chimney project …..

paulburton

Hello all,

You have all been very helpful in the past, so hoping so now .......

My new kitchen project ......

I have chopped out, and installed a new lintel in my chimney breast, so I can put my oven and hob into it. I am using a standard 600mm wide Bosch gas hob, and have enough height for a extractor.

I am looking at installing something like

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=110441249116&ssPageName=STRK:MEWAX:IT

or

http://cgi.ebay.co.uk/Bosch-DHL535BGB-Canopy-Hood_W0QQitemZ110454201361QQcmdZViewItemQQptZUK_H_G_Major_Appliances_Oven_Cooker_Hoods_ET?hash=item19b7955c11

Now I can't extract outside, as no external wall, and don't really want to just circulate the air, so intend to use the chimney. After lots of research, I know it's not a great idea because of condensation and grease in the old chimney, even though I will never use it as a live fire, but I am thinking about running a pipe all the way up, something like

http://cgi.ebay.co.uk/100mm-x-10m-PU-flexible-ducting-fume-woodwaste-dust_W0QQitemZ180432499888QQcmdZViewItemQQptZLH_DefaultDomain_3?hash=item2a029d74b0

not the cheap tumble dryer style pipe, something that will last, and be ok in an old chimney, full of soot

I know I read something about only being able to extract up to 3 meters, mine is only a standard two story house, but guessing more like 8 to 10 meters to the top of the chimney pots, will it still be ok ? surly hot air rises, so will it keep going to the top ?


What do people think ? any other ideas ?

Many thanks for reading,


Paul

majjie

Hi Paul,

It's not the hot air that's the problem ... it's the steam and vapourised grease. A normal domestic cooker hood has no chance of moving those the whole height of the house, without them condensing back into water and liquid grease.

Over time, this lovely greasy mixture will dribble back down the chimney (or vent inside the chimney). Some or all of the water will dry out ... but the grease will accumulate, may block the ducting, and will constitute a fire hazard.

Sorry ... but it's just not a good idea!

majjie

P.S If you want some expert advice ... you could always e-mail D.R Cooker Hoods, who distribute Elica cooker hoods in this country.

http://www.elica.co.uk/

They really know their stuff. Choose one of their hoods first, of course ... and ask about venting it up the chimney ... then let us know what they said.

CKdesigner

Hi

Completely agree with Majjie. I have seen the aftermath of a chimney fire caused by fitting a normal cooker hood and ducting up the chimney. They lost the whole house. So there is no way I would ever design a kitchen that way without spending a lot of money (several thousands infact) on a properly designed chimney extraction system.

Can you not go into the chimney for about 500mm and then turn left or right and bust through the side to get to the outside at ceiling level?

CK