Can you vent a cooking range into a chimney?

BrightFutureFoodsJanuary 28, 2011

I know you can't vent into fireplace chimney or one used for another appliance. Here's my situation.

We are doing a home addition/remodel in our cold-climate Vermont home, including moving the kitchen and adding a 48" Capital Culinarian (6 burners & Grill). The kitchen design has the range located on an interior wall against a brick chimney with 3 separate flues. The builder's "plan" is to vent the range into the flue that was previously used to vent a propane wood stove. The flue is separate all the way up through the roof and will be sealed from any use other than venting the range.

I have concerns as to whether venting this way will work? It'll be a long run to the top of the chimney...maybe 20ft (up through 2nd floor and out roof). Have heard conflicting things but seems that it can pass code as long as that flue is dedicated to the hood vent and nothing else.

Any advice as to the above, and as to what type of ventilation system/blower/CFM etc. would be best and affordable would be appreciated.

We are kind of stretching things with the high cost of the range (wife is skeptical but indulging my culinary inclinations) and don't want the venting to be the kicker that causes marital..hehem...discord!

Thanks in advance for your advice!

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drewguy

20 feet straight up is not an overly long run. You may need more CFM than if you were going straight back through the wall, though.

I would check codes to make sure but I don't see why running a properly lined vent duct through a chimney would be different than running it through a ceiling or between floors.

    Bookmark   January 28, 2011 at 10:56AM
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BrightFutureFoods

Thanks, drewguy.

I think you're right, just not sure. Did some quick research and found this in the National Fire Protection Standards book (NFPS):

10.7.2.4
A ventilating hood shall be installed above an open top broiler in a residence.

10.7.2.4.6
The hood shall be exhausted directly through and outside wall to the outside or connected to a suitable chimney flue used for no other purpose.

I need to figure out whether a vent hood w/ built in blower will do the job or do I need an in-line or remote set up?

    Bookmark   January 28, 2011 at 2:39PM
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drewguy

There's not a huge difference between in line and built-in. Either way you have to move the air that distance. Putting it on top of the chimney means more expense and harder to reach, although possibly more quiet.

    Bookmark   January 28, 2011 at 5:15PM
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BrightFutureFoods

Yes, quiet would be nice, but i'm already pushing the extremes of "expense" so I appreciate that information.

Given the distance and the cold temps here, i've been concerned i'll need high CFM in order to get the flow I need to expel smoke/grease without the kind of heat a fireplace or furnace would generate. The idea of an air exchange system to compensate isn't all that appealing. Of course, my house is an efficiency nightmare as it's not very airtight, so maybe not necessary.

    Bookmark   January 28, 2011 at 11:08PM
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kframe19

If you do vent it into a chimney, every few years you should inspect it to make sure you're not getting a buildup of cooking fats in the flue that could ignite.

    Bookmark   January 31, 2011 at 10:36AM
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BrightFutureFoods

Probably wise, Kframe19. I went to visit Trevor Lawson at Eurostoves this past weekend and checked out the various high powered ranges in their working kitchen, as well as the hood/venting systems. Seems i'll be ok. Seems my one issue may be not being able to fit as large a diameter pipe as i'd like into the chimney flue. Probably won't accommodate a 10" pipe, but Trevor said smaller diameter would work (albeit not as effectively) but would be noisier.

    Bookmark   January 31, 2011 at 4:28PM
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