Do I need an extractor fan over the oven/microwave (open plan kitchen)

26 days ago

Hi,

We are about to start our kitchen / diner extension which is approx a 60m2 space. We will be installing an externally venting hob but was wondering what people do for ovens and microwaves that are built into units? Our oven will be against a wall while our hob is on an island. Do I need to bother?

thanks!

Dave

Featured Answer

Jonathan

26 days ago

It also depends on your budget for appliances. For instance Kuppersbusch have a catalytic converter to get rid of odours. And Bora and Gaggenau have steam ovens with systems that stops steam escaping when you open the door.

Grease in the air can come from the oven especially if you cook meat. And mechanical ventilation can help but it’s not generally thought of as necessary.

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Comments (12)

Daisy England
26 days ago
Ovens and microwaves don’t need one.
davesheff thanked Daisy England
Frank
26 days ago
If you're considering a steam oven, then also consider putting an extractor in. Our case has the ovens near a rooflight, and warm moist air rises into there and we get mould by the rooflight upstand if we don't clean it all the time. It's one of those hindsight things ...
davesheff thanked Frank
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I'm sorry to say that you would be throwing good money after bad. The type of extractor you've linked to is a bathroom model. These gently extractor moist air over a period of time. technically it extracts 220m3 per hour. Even the most basic 'cheap' cooking extractors will deal with 3 times that volume and good ones will extract 6 or 7 times that volume. In real terms that would mean you need between 4 to 7 of those extractors to do the job of what a single dedicated cooking extractor could achieve. When it comes to dealing with greasy smoke filled air, then the difference between a simple ceiling extractor and a dedicated cooking extractor is the difference between a gentle streaming brook and the grand canyon.
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extraction comes under part F of building regs, so your architect should be detailing this in the plans for the extension. As i understand part F the important bit is Part F When inserting or removing an internal wall, care should be taken not to make ventilation worse. Any new kitchen, a toilet with no openable window; a bath/shower room or utility room should be provided with a mechanical extract fan. The type of room will determine how much ventilation is required. Part F says that where a kitchen previously had only a recirculating fan this can be retained/replaced if it is made no worse. However, I would always recommend fitting an extractor to deal with condensation. • Kitchen: 30l/s if over the hob and 60l/s if placed elsewhere so you could have an expelair type extractor on an external wall that will comply with regs at a minimum.
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davesheff
Original Author
26 days ago
Would a simple inline ceiling fan do the job just above the oven ?
Kim
26 days ago
An inline ceiling fan would definitely do the job. That's all we have as extraction in our kitchen. One outlet grill in ceiling near hob and another one near the oven. Both go into a centrifugal inline fan in the loft and out through the side of the house. Been 2 years, I cook a lot, and no issues. Matt white ceiling paint still spotless.
davesheff thanked Kim
Donal Fitzpatrick
26 days ago
Extraction from cooking in an open plan kitchen is something to take careful consideration off. First off in most cases it is not considered necessary to extract from the oven and microwave. It is important to consider the bigger picture. If extraction isn't working correctly how will you know in the future. What will be the tell tale signs. The obvious one is that your kitchen is full of smoke, steam or cooking smells when you cook. The less obvious is that your air to water (ATW) system filter is clogging with dust & grease. Your furniture smells of last weekends stir-fry and your clothes will have a smell of last nights dinner. In other words extraction is vital for the overall comfort & performance of the whole room and by extention the house, not just the kitchen.

The extraction over your hob should be carefully thought out to make sure it is up to the expectations you have and the performance of the whole house, particularly if you are building a modern A rated house. I hope this is helpful. Best of luck.
davesheff thanked Donal Fitzpatrick
davesheff
Original Author
26 days ago
Thanks guys. Donal, we will be using an extracting hob, it was just the oven smells I was more concerned about .

Thanks!
rinked
25 days ago
They usually don't need one, but with an open plan kitchen do take into account the amount of m3 your hob will extract (and turn it on when you start cooking, not when the fumes build up).

Example for calculation: https://www.coolblue.nl/en/advice/calculate-extraction-capacity.html
davesheff thanked rinked
PRO
Luke BORA ASM London
25 days ago
The BORA X BO stops you getting a face full of steam when you open the door. Its automatic steam extraction function draws the steam backwards before the door is opened – dehumidified, cooled and filtered. The odour filter even minimises the typical strong smell of fish.
davesheff thanked Luke BORA ASM London
PRO
Luxe Ltd
25 days ago
Your oven and microwave don't need extraction, just the hob. If the venting hob is venting outside then you are all good. If you decide to recirculate the venting hob then you would need to put an in-line fan somewhere to pass building regs (:
davesheff thanked Luxe Ltd
davesheff
Original Author
25 days ago
Yep it will be an outside venting hob.

I was just concerned about smells when we open the oven / microwave door. Whilst the ceiling is exposed I was thinking of just putting up a simple ceiling 100mm extractor fan and duct out to the side of the house. That bora oven is like £4k!
PRO
Luxe Ltd
25 days ago
It can never hurt to put an in-line extractor in there too.

I always spec the Novy Easy vented hob (similar to Bora Pure) because when you finish cooking it keeps the extractor on a low setting for 30 minutes to help clear the room out. I imagine Bora have a similar setting though they are pretty much on par with each other.

I've never designed in a Bora oven though I would love to know what they are like!

Do I need an extractor fan over the oven/microwave (open plan kitchen)

Jonathan

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Do I need an extractor fan over the oven/microwave (open plan kitchen)

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