Venting range hood through soffit


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Old 06-22-23, 09:23 PM
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Venting range hood through soffit

Anyone with experience venting a range hood through the soffit ? I'd like to move the stove between two 40'' x 40'' windows 44''apart in the front wall of the house. The soffit is 24'' wide . My concern is the smoke, steam, grease etc to go into the attic or stain the soffit or bricks on the wall in windy conditions also icicles in winter.
The kitchen has two exterior walls
Right now the stove vents through a ducted fan installed on the other exterior wall.
Thank you
 
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Old 06-22-23, 11:25 PM
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I don't recommend venting through the soffit.
It would be better to vent straight up thru the roof.
 
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Old 06-23-23, 07:06 AM
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Through the roof is the best. You want the duct run to be as short as possible and with the least amounts of bends. You really want to avoid 90 bends as they really hurt airflow. There are duct calculators online that will help you figure if it's better for airflow for example; a longer but straight run up through the roof or a shorter run through the soffit with 90 bends. The longer run might be better if it's straighter. You just need to run the numbers and see which is best for flow.
 
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Old 06-23-23, 03:24 PM
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It's likely a code violation to vent out the soffit that close to a window anyway. In the US it must be =/>3 ft to an operable window and =/> 10 feet from grade. Dunno what Canada's code says.
 
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Old 06-23-23, 08:56 PM
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Not sure about the local code but there is more than 3' to the windows and 12' from grade.
Roof venting has some issues
The space where the stove is going to go is between two windows 44'' apart but I'm not sure how to center the hood on the wall for there is a rafter exactly where the duct needs to go through.
Other consideration is in winter temps go 20 bellow F and is common 25'' of snow on the roof
Insulate the duct? Will the vent damper prevent cold air coming in and sinking down the duct?
Thanks for replies

 
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Old 06-23-23, 09:02 PM
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Not sure how there can be more than 3 ft to the windows if the windows are 44" apart and the vent is going between them. That math doesn't really add up. Are you saying the soffit is more than 3 ft from the open window?

And rafters are on roofs. I think you mean "stud".
 
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Old 06-24-23, 07:44 PM
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You are correct, if the vent is installed in the front side of the soffit right under the gutters there are 33'' direct line to the edge of a window
The vent could be moved further away from the windows but it ll add length and elbows to the duct
Venting through the soffit or the roof requires cutting a hole in the kitchen ceiling to run the duct up the attic.
Right above that point there is a ceiling joist , sorry I got mixed up with the names
Regards
 
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Old 06-24-23, 07:52 PM
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Ah, ceiling joist. That makes more sense. Single joists can be headed off to adjacent joists to create an opening for ductwork.
 
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Old 06-25-23, 03:38 PM
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I ll look into that
Thank you
 
 

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