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Old 08-21-2014, 12:39 PM   #1
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Range Vent Install

Our home was built with a down draft vent for a Jenn Air cook top, but we want to install venting for a range hood. That vent can access an exterior wall some 8 feet away via a soffit, but passage through the wall is there blocked by existing water supply pipes and ABS cleanout and waste lines.

Is it legal to then travel down a vertical soffit, which would have to be enlarged in one dimension, to a point where the range vent can connect with the existing vent for the down draft? To do all of this will require a total of 5 turns.

Attached are some pictures. One shows the existing downdraft venting and blower. The net shows the horizontal and vertical soffits. The last is the existing vent that I hope to connect with.
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Range Vent Install-venting-009.jpg   Range Vent Install-venting-010.jpg   Range Vent Install-venting-011.jpg  
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Old 08-23-2014, 07:20 AM   #2
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I have IRC 2000, and it doesn't say much about the range hoods, except follow the hood makers instruction. Search the models and their manuals. Most I found in past was duct sizing, but as far as fire code, their manual usually say refer to the local code.

I think certain gauge metal duct and sealed joint would pass the inspection.

The distance and the turns would stop any inspector, though, knowledgeable diy or a professional. I think 5 is too many turns except for industrial model fans, or you'd have to use the highest fan setting and cook while there is a hurricane blowing above you. Remember that you are burying that pipe.

How about going directly through the wall and build a drop ceiling in the room opposite the tile wall? Then go to the exterior wall?

Any case, my thoughts on a next kitchen would be using a combination hood (with light and switches) with an exterior motor and fan. Fantech has at least the fan housing that's hung outside.
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Old 08-25-2014, 07:28 AM   #3
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I think five turns and the length you want to go are way too much. It'd make a built-in grease trap, not to mention fire hazard. There's a reason most stoves are on an exterior wall.

Can't say exactly what it should be, but you need some other plan.
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Old 08-25-2014, 07:42 AM   #4
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Consider an exterior exhaust fan---those pull the air through the duct---still--5 90's is a lot of resistance.
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