How to fit an extractor in an original slate kitchen chimney surround?

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Has anyone done this?.We are planning on fitting a rangemaster 110 cms wide into the kitchen fireplace which we discovered last night is made of slate surprisingly.It was covered with so many layers of paint and plaster i assumed it was wood.I don't want to get rid of it but we need an efficient extractor that will fit within as we cook a lot of asian food.Where can i find a really neat and efficient extractor and how far up the chimney can i go before having to duct out?.

I dont know the answer but we have just had a devil of a job getting our extractor ducted out due to miserable neighbours- so our builder found a solution which is carbon filters that absorb all the smells- so we haven't got ours ducted at all just the filters in.

Maybe that would be an option? Although we probably dont cook that much strongly smelling food (well DH does but not loads!) so it may not be best option for you.

Thank-you Thandeka.I have found a small integrated extractor that will fit and is relatively powerful - at about 4 on the efficiency scale.A local kitchen shop has been incredibly good with advice.I think we can duct up the chimney and then veer off into the roof space and out inbetween the extensions.I wish there were independant kitchen designers arround who could give general advice and not be allied to any particular kitchen conpany.

First point - no extractor is powerfull enough to push up the whole length of a chimney to the roof - the hot air / steam will get so far up then cool - then the steam turns back to water & will either fall back down the ducting or find a way out leaving a damp patch somewhere higher up.
Second point - extractors with filters are little more than useless as they do nothing with the water vapour (steam) which most cooking produces - that carries on round the room taking the grease with it - it then deposits itself onto your surfaces (kitchen doors, ceiling etc) leaving them sticky, dust then lands on this
the whole point of an extractor is to take the steam. grease & smells out of the house leaving your kitchen nice & clean
so buy the best extractor you can, make sure it is ducted correctly & lastly - turn it on
From an independant kitchen expert - no charge for advise

Dollydaydreamer is it ok to just go up to the kitchen roof and then duct out sideways in the roof space.We do need a really efficient extractor as we do lots of cooking - as dh loves to cook and we have 4 dc's.

yes - if your kitchen is single storey then thats fine - upwards no more than about 1200mm is ok - after that the air in the ducting cools & the steam turns back to water vapour - also a point about the rating of extractors - an A means energy efficiency - not a rating of how powerful - just that it will use less electric than one rated B etc - look for how many cubic metres of air movement per hour - the more the better