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Old 06-17-2014, 06:27 PM   #1
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Range Hood venting, is this ok?


Hi all,

I'm remodeling my kitchen and putting in a island cooktop hence now need to install a island range hood. In order to keep the venting pipes concealed, I'd like to run the venting pipe in parallel and in between the ceiling joists (see image), until where I can make a connection to the old exhaust pipe that is about 8" below the ceiling (in boxed soffits). However to make this connection, I need to make a right angle "downward". Is this downward turn acceptable? will this affect the venting performance of the hood?

Thanks!
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Old 06-17-2014, 07:40 PM   #2
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Far better to go straight up and get rid of the old vent on the roof, nay be able to reuse it in the new location.
Every elbow is going to cause a restriction.
Running it horizontal and any moisture or grease is going to lay there and cause issues.
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Old 06-17-2014, 08:36 PM   #3
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Quote:
Originally Posted by joecaption View Post
Far better to go straight up and get rid of the old vent on the roof, nay be able to reuse it in the new location.
Every elbow is going to cause a restriction.
Running it horizontal and any moisture or grease is going to lay there and cause issues.
This is a 2 story house, with the location of this kitchen, it's not possible to go straight up unless I can deal with a pipe running through the middle of the a 2nd floor bedroom. The original vent goes straight sideways out the side of the house.
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Old 06-17-2014, 09:17 PM   #4
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If every elbow will cause a restriction, can I compensate this by buying a higher cfm range hood?
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Old 06-17-2014, 09:43 PM   #5
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That will compensate somewhat but the length of the horizontal run also reduces the hoods's performance and could cause issues down the road as joecaption has already mentioned. It will work....how well, you won't know until you've installed it and tried
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Old 06-18-2014, 11:25 PM   #6
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The manufacturer's website has models and manuals which tells the ducting limits. CFM specs may be at max fan speed which can be too loud, so make sure it lists the range. 1-2 elbows don't matter but don't reduce required duct size.
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