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-   -   Roof penatration size? (http://www.diychatroom.com/f9/roof-penatration-size-79523/)

pttcc 08-23-2010 11:26 PM

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! :laughing:

OldNBroken 08-24-2010 12:17 AM

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.

seeyou 08-24-2010 04:45 AM

Quote:

Originally Posted by pttcc (Post 490284)
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! :laughing:

What sizes are the outlets on the units? Kitchen fans vary widely. Bath fans are usually 3" or 4".

cbaileyau 08-24-2010 09:08 AM

Our new range hood recommends a minimum of a 6in. diameter duct.

OldNBroken 08-24-2010 05:11 PM

then an 8" hole would do nicely.

federer 08-28-2010 11:23 PM

how do you find out where the ducts run to?


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