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Old 08-23-2010, 11:26 PM   #1
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Roof penatration size?


I am going to open some holes on the flat roof before I call my roofer to start the re-roofing project.

1. Kitchen extractor pipe.
2. (2) bathroom fans outlet

What are the usual sizes of these two kind of opening?

Thanks!

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Old 08-24-2010, 12:17 AM   #2
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Roof penatration size?


Large enough to run your ducting through. The flange of the roof flashing will cover a much larger area than the actual vent size so don't be afraid to go an inch or two oversized.

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Old 08-24-2010, 04:45 AM   #3
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Roof penatration size?


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Originally Posted by pttcc View Post
I am going to open some holes on the flat roof before I call my roofer to start the re-roofing project.

1. Kitchen extractor pipe.
2. (2) bathroom fans outlet

What are the usual sizes of these two kind of opening?

Thanks!
What sizes are the outlets on the units? Kitchen fans vary widely. Bath fans are usually 3" or 4".
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Old 08-24-2010, 09:08 AM   #4
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Roof penatration size?


Our new range hood recommends a minimum of a 6in. diameter duct.
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Old 08-24-2010, 05:11 PM   #5
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Roof penatration size?


then an 8" hole would do nicely.
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Old 08-28-2010, 11:23 PM   #6
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Roof penatration size?


how do you find out where the ducts run to?

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