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  1. #1
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    Anyone with experience in commercial kitchen extraction methods

    Trying to sort out a commercial kitchen extractor hood, that is both incredibly noisy and very inefficient.
    I have googled today and this is a dark art.Can anyone help?

  2. #2
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    Commercial kitchen hoods are very effective, most times they can serve multiple extraction points.

    I had one installed in my apartment in The Netherlands, in an open plan living and kitchen and the noise would have been far less as a cheap domestic one that rattles all the time.

    Still planning my real house right now, if I could only find a good architect that wants to go with my "wild" ideas. That will have a commercial one for sure!

    Good extraction fans have a hood! Take the lid of any pot on the stove, filled with boiling water and most, if not all the domestic ones can't handle the flow of hot air, half of it will escape the extraction fan and end up in kitchen or your open plan living.

    I would go with a commercial one any time, and really, they are not that expensive!
    If everything seems under control, you're not going fast enough.

  3. #3
    Thailand Expat
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    My experience. Two fan hoods with a fan outside.

    The fans are noisy? Because the bearings have failed or are going to. The noise is transfected through the ducting. The bearings need to be replaced.

    The fan is oversized and the velocity of the air is so high it creates unwanted noise. The fan needs a larger pulley or the motor a smaller one. In our case we opened up the louvres in the closed kitchen which reduced the flow and noise from the open kitchen.
    Better to think inside the pub, than outside the box?
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  4. #4
    Pronce. PH said so AGAIN!
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    Can you not just duct out the cooking fumes with an inflow of cooler air from below?

    Presumably if the duct is short enough it will vent before the fumes cool enough to start falling back?

  5. #5
    Thailand Expat
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    If its noisy its generally the fault of the impeller, you need a bigger one to keep the peripheral speed down.

  6. #6
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    Its not the bearings, its just noise. I think the motors are too big. The motors pulling fresh air in have a belt and a fan, the fans extracting air are a sealed unit. But the hood designed in thailand is an old idea, its called a short circuit hood with air in and air out ducts adjacent at each end of the hood.
    And the ratio of air in and out is wrong. There should be slightly more air in than out, this helps to push air out. Our system has 35% more air out than in!
    I am going to duct the air in to registers on both sides of the hood and then use the extra ducts to take air put.

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