Kitchen Range Vent


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Old 01-03-14, 05:32 PM
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Kitchen Range Vent

If I have a choice of venting through the roof or through a side wall which is preferred?
 
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Old 01-03-14, 06:59 PM
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Through a side wall. Why disturb the roof when you don't need to.
 
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Old 01-06-14, 04:58 AM
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OK, you confirmed my thinking about the side vent rather than through the roof.
Now, what about the duct for this kitchen range.
In a cold northern attic should it be insulated?
Should it be rigid and not flex duct?
 
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Old 01-06-14, 05:12 AM
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I'm reading sidewall, but then you ask about insulation in a cold attic?? Where are you looking to vent this? In the soffit or close below it and all of that moist warm air is simply going right into the attic.

Bud
 
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Old 01-06-14, 06:01 AM
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As Bud says, you don't want to vent into the attic area. You are going directly to the outside, correct?. I wouldn't worry about the duct work being in the cold. Insulation won't do any thing for exhaust gas except for noise.
 
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Old 01-06-14, 06:44 AM
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Yes I am ducting the kitchen range hood from the kitchen through ceiling to the cold attic through the side wall to the outside. Being a kitchen range there will be lots of warm water vapor that could condense on cold non-insulated metal duct, therefore my question about insulation. Seems to me that insulated duct is preferred to minimize condensation in the duct.
 
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Old 01-06-14, 10:32 AM
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You have a point, but again since its being forced through via fan I don't think it will have time to condense into water or for that matter even wateer vapor will just be blown out. IMHO
 
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Old 01-06-14, 10:43 AM
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I'd insulate. I'd imagine the attic can get pretty cold in Iowa? Oh...and you need metal duct with sealed seams.

More than water vapor...any grease fumes (and there will be grease in the fumes) will quickly cool and cling to the sides, even with good filters and airflow.

You really want to take the absolute shortest route. If you can go straight out the back of the hood or just up into a cabinet and then out, that would be better.
 
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Old 01-06-14, 10:55 AM
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There is also the problem that the duct filled with cold air may tend to backdraft when not running. Dampers, if they are there don't block 100%. Even insulation may not stop this.

Bud
 
 

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