Recirculating extractor hood over gas hob - permitted?

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Hi

not sure if this is gas regs, electricity regs or building regs, so...

I want to install a recirculating extractor hood in a cabinet over a gas hob. I am aware of the requirement for 750mm height clearance, but one article I found also said that you aren't allowed to use the RECIRCULATING type with a gas hob at all ("Note: One point to note though is that you will be unable to use a recirculating hood if you have any gas appliances in your kitchen. If you do then you will need to use an extraction hood."). The other 20 articles I read don't mention anything about that. Is it permitted?

Also, while I'm here - where are the exit vents for the recirculated air? Does the device need clearance at the sides/back? I'm looking at this one and putting it inside a regular kitchen unit (which 'sealed' other than the big, side-hinged cupboard door on the open front of it).

https://ibb.co/DQ8tBkq

https://www.shipitappliances.com/cis ooker-hoods/50cm-cooker-hoods/sia-uc52si-52cm-canopy-kitchen-cooker-hood-extractor-fan-in-silver/


thanks
 
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image.jpg Recirculating is no longer permitted in new builds , ( probably because it’s pointless and ineffective) but you can install if you wish .
You will have the added expensive of changing the carbon filter several times a year .
Could cost more than the unit in filters per year .
I connected mine to roof vent .
 
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why not?

I have tenants, who love to shallow-fry food. Every surface in the entire kitchen is coated with a layer of grease.

I'm thinking that using the (above linked) unit to suck the vapourised oil from the hob into a grease filter (which can later be washed) can only help. Why would it not?
 
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They appear to be more decorative than functional, it does not take long for a filter to get clogged up & I'm not sure they are that efficient to begin with, do you really think your tenants will bother to wash it out regularly. They are cheap for a reason.
 
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I have a bosch extractor with similar metal mesh grease traps - Works well - Traps go in the dishwasher every now and again...
 
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No idea about modern regs. The previous owners did an extension and fitted a new kitchen about 10 yrs ago. The "extractor" is a recirculation model. The door opens upwards and locks into position. The extractor is sandwiched between two fullsized cupboards.

I change the carbon filter every six months. Costs about £8 a time.
 
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Re-circulating hoods with greased up filters accelerate kitchen fires if flames from the hob ignite the greasy filters. ( Source a retired Fire Prevention Officer ).. A valid reason for not fitting them in a rented property
 
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why not?

I have tenants, who love to shallow-fry food. Every surface in the entire kitchen is coated with a layer of grease.

I'm thinking that using the (above linked) unit to suck the vapourised oil from the hob into a grease filter (which can later be washed) can only help. Why would it not?
Will not prevent grease being splashed , filter will pick up less than 10% , most will simply splash the cooker area .
 

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