Any good ideas?

[hightower]

Please see the attached files, I'm needing some ideas and possibly some out of the box thinking.

This is a surround for an old range cooker in that house of my mate's that I'm rewiring. He's planning to put a range style cooker here but we need to think about extraction. At the top is a concrete lintel, 1620mm is the height of the opening, and there's some ducting in the corner as you can see - this is 150mm diameter, and although it can be cut to shorten, it would be a pain to remove and replace.

Originally we were going to build down a false layer to hold a hood, but given the new range would be 900m height this would bring the gap between cooker and hood to about 500mm. So the next idea was to fit a standard kitchen extractor unit (like a wall mounted one) to the current ducting, but I don't think it would be fit for purpose and would get splattered in grease. If we did go down this route however, I think LED tape would be up to the job of lighting the area in place of the lights built in to a typical hood.

So, any bright ideas anyone, extraction mainly.

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[hightower]

found this on a "ask the expert" site.

A minimum of 750mm clearance is required above a gas hob and 650mm above an electric hob to a cooker hood. The gap may be reduced to 727mm above a gas hob but the hood must be cleaned regularly to prevent a fire hazard. Wall units either side of a hood must be at least 366mm above. A minimum of 300mm clearance is required either side of the hob if installing next to a larder unit or flammable material.

However, if the hood manufacturer specifies a less distance, this should be taken int consideration.

Is this distance recommendation or is it set in stone with building regulations or the like?

How far back from the front does the lintel go? If I was using that chimney liner I'd want it positioned centrally. Would it be possible to re position centrally an incorporate the extracter into the bottom of the chimney flush with bottom of the lintel? You'd have to remove the insulating material from around the liner to reposition though. Personally I'd look to take out chimney breast completely as the lintel is far to low IMO and wouldn't look right.

Not possible to reposition the existing ducting. The lintel goes the full depth of the surround. This install is on an old cottage, and I quite disagree that it wouldn't look right. In fact, I think if we get it right it will look stunning.

Where is the other end of the duct? Would it be possible to mount a remote fan unit at the far end then just have a grille at the cooker end?

The duct is cut through the lintel in the back corner as you can see in the pictures, it then rises in the stack about a foot above the top of the lintel and exist through the wall to the outside. I'm not sure there's any room to mount a fan in this short run, and besides, it wouldn't be accessible if the stack if filled back in afterwards.

 

[davesparks]

The duct is cut through the lintel in the back corner as you can see in the pictures, it then rises in the stack about a foot above the top of the lintel and exist through the wall to the outside. I'm not sure there's any room to mount a fan in this short run, and besides, it wouldn't be accessible if the stack if filled back in afterwards.

With a remote fan unit it normally gets mounted externally over the end of the duct rather than inline,

 

[hightower]

With a remote fan unit it normally gets mounted externally over the end of the duct rather than inline,

Ah, I hadn't realised - you have a link to any?

 

[telectrix]

as dave just said. mount a fan on the outside wall.

here's a link:

150mm External Centrifugal fan (600m3/hr) | eBay - http://www.ebay.co.uk/itm/150mm-External-Centrifugal-fan-600m3-hr-/23213830

6" duct diameter.

 

[hightower]

I've put that idea to him. Thanks @davesparks and @telectrix

 

[Pat H]

I have a cooker hood fan over a cooker with no easy external access. So I ducted the extractor outlet and added a fan on the exit to assist with the flow. Ran the fan power back outside the duct and fed it from the cooker hood fan so they run together.

 

[Wilko]

found this on a "ask the expert" site ...
A minimum of 750mm clearance is required above a gas hob and 650mm above an electric hob to a cooker hood...

I use 750mm too and measure it from the top of the pot stands to the bottom of the extractor. I have seen a few extractors with heat damage that have been lower, and even a couple of heat damaged wall units that were at the right height but not set back from the edge of the hob. These would have all seen heavy use though.

 

[Wilko]

Is this distance recommendation or is it set in stone with building regulations or the like?

Hi - good question HT !
I found this ref to BS 6172 "installation and maintenance of domestic cooking appliances" in a Gas Safe tech bulletin which seems to lay it out fairly well. Hope that helps

http://www.hse.gov.uk/gas/landlords...usly-used-domestic-gas-cooking-appliances.pdf

 

[rolyberkin]

Depends whether he actually wants it to work properly or is he just going through the motions?

You probably need to (Carefully) cut out a central section and move the existing extract to there, you also need to consider cleanable filtration the cheapest working option long run would be something like the one below. The load bearing lintel will be the bit under the brickwork, the rest is likely to be a cast concrete slab. Just man up and cut it out, oh and use a dust mask!

http://www.johnlewis.com/siemens-lb...1rxKXG3A0ez_SXVXd9r3vxoCKZPw_wcB&gclsrc=aw.ds

 

[rolyberkin]

DHL535BGB Bosch Canopy cooker hood 4242002259536 | eBay - http://www.ebay.co.uk/itm/DHL535BGB-Bosch-Canopy-cooker-hood-/222360646390?hash=item33c5ba32f6:g:COYAAOSwImRYW7i9

DHL535BGB Bosch Canopy cooker hood 4242002259536 | eBay - http://www.ebay.co.uk/itm/DHL535BGB-Bosch-Canopy-cooker-hood-/222360646390?hash=item33c5ba32f6:g:COYAAOSwImRYW7i9

May even buy one myself they are so cheap!

 

[hightower]

Height though @rolyberkin - no room to fit that

 

[rolyberkin]

What is the measurement above the lowest point of the existing concrete slab then, what I have listed needs to mounted into a hole cut into the slab, is there not enough space?

 

[LankyWill]

tell him to enter the real world and accept the fact that he either has to raise the lintel or have a bodge job done instead. You cant polish a turd.

 

[Wilko]

tell him to enter the real world and accept the fact that he either has to raise the lintel or have a bodge job done instead. You cant polish a turd.

Made me laugh, hadn't heard that for a while ... But you can put lipstick on a pig

 

[dmxtothemax]

What about finding a cooker with less height ?