Suitable size of extractor fan for 16.5metres cubed kitchen

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Old 02-16-13, 01:29 PM
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Suitable size of extractor fan for 16.5metres cubed kitchen

My first post so gently please. LOL

We have a kitchen in which we use a large griddle for cooking bacon and sausages daily for our clientele in our Guesthouse, and it can smoke. We do have a hood over the stove but the smoke layer forms directly under the ceiling and misses the extraction in the hood mostly.

We thought to remove the hood and install an extractor fan to vent out the smoke to atmosphere. It is straight through the wall to open air and there is power as well.

The kitchen volume is 16.5 cubic metres or 583 cubic feet. Would a 4" bathroom type fan be enough or would we need the much more expensive 6"?

Any helpful advice appreciated.

PH
 
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Old 02-16-13, 01:39 PM
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Bathroom fans are not really designed for your use. They pull stale / moist air out. The motors are not always designed to handle cooking grease and other byproducts of cooking.

Does your hood have a fan in it. You may be able to get a more powerful power unit. If no motor, look for a unit that mounts to the exhaust end of the hood pipe. They mount outside to keep the niose down and are generally quite powerfull.

If you want to go through the wall, look for a through the wall kitchen exhaust fan.
 
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Old 02-16-13, 01:42 PM
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Welcome from the UK

It sounds like you have a business there (versus a home residence).

Here in the States we would be required to have a large exhaust fan with hood and maybe a fire suppression system also.

In your case I'm not sure what the code calls for but you definitely can not use a bathroom fan. A 4" vent just wont cut it.

It sounds like you are going to need a sort of commercial exhaust hood. It may even need to bigger than 6"......... or a pretty decent home kitchen exhaust fan with a 4" x 10" duct.
 
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Old 02-16-13, 01:48 PM
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Yes we are commercial, we are as said a Guesthouse.

The hood we have is too low to catch the heat layer we want to vent out. We were quoted 600+ to do this (install a fan) and thought hmm can do better.

PH
 
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Old 02-16-13, 07:36 PM
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So that is about a thousand dollars US.

I'm looking at 400-600 US for a good exhaust fan

That doesn't sound unreasonable. Did you try another company for a quote ?
 
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Old 02-17-13, 12:59 AM
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My real question is this:

Will a 6" fan cope with the quoted volume of the kitchen.

PH
 
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Old 02-17-13, 04:46 AM
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IMO, a 6" vent would handle it, however you would need to choose your fan carefully. As stated a small bathroom fan will not work. I have installed roof mounted exhaust fan units for heavily used kitchens with approximately 500 cfm of air, which will exchange the stale air quickly. Being on the roof, they had little noise, used a 6" vent pipe and the hood area was a little deeper than normal.
 
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