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 Post subject: 4" Kitchen extractor fan
PostPosted: Tue Mar 05, 2019 10:57 am 
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Hi,

I'm looking to replace a wall mounted pull cord kitchen extractor fan for a 4" duct.

Is there any reason as to why a 4" bathroom extractor fan would not be suitable? It seems that 4" fans are classified as bathroom and 6" are classified as kitchen. Is that the only difference?

Also, are there any that people in the trade recommend with a good lifetime and flow rate?


Thanks.


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PostPosted: Tue Mar 05, 2019 11:31 am 
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The size of fan relates to the flow rate and there are rules as to how much air 'replacement' you have to meet and given bathrooms are invariably smaller than kitchens the bathroom fan is usually smaller.

You's get's what's you's pay for so more expense = quieter/better airflow. Can't recommend anyone in particular (anyone?) as I tend to go for the cheapest option........

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PostPosted: Tue Mar 05, 2019 1:04 pm 
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It is an enclosed kitchenette, so not a large area. No bigger than a small ensuite.


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PostPosted: Tue Mar 05, 2019 3:12 pm 
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To effectively exhaust cooking smells (which might also contain carbons & fats) up to 4x the extraction rate compared to a bathroom requirement. Bathroom fans generally give a gentle flow whereas when you hit the cooker extraction switch you want action, burnt toast or the roast; I had a hob extraction fan in an apartment which would bend the gas cooking flame around the pots also not a good design


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PostPosted: Wed Mar 06, 2019 7:45 pm 
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Would this one be suitable?

ST100PC Silent Tornado Hi-Power Bathroom Fan with Pull Cord

I estimate the volume of the kitchenette would be approx 25m3 - 30m3. So giving that it has an extraction rate of 97m3/hr that would be 3 turnovers of air per hour.

Is that sufficient extraction rate?


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PostPosted: Thu Mar 07, 2019 8:47 am 
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That room volume is actually even smaller considering the cupboards, fridge and cooker. Would be closer to 4 turnovers of air per hour.


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PostPosted: Thu Mar 07, 2019 6:40 pm 
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I'm sure that fan will be fine, as it's a replacement the regs don't apply. So you can fit pretty much what you like. The fan of course will only "extract" if there is an equivalent airflow in.

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PostPosted: Fri Mar 08, 2019 8:36 pm 
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For 1/2 the price of the
Silent Tornado Bathroom Fan with Pull Cord ST100PC - £47 delivered

I can get this one:
MANROSE XF100P 15W BATHROOM EXTRACTOR FAN - £19

Is the first one a better purchase or would the latter suffice?


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