Cartoon Network

09 January 2019

[DIY] Vent sizes

 

This might be a no brainer, but I have to ask this.  There is a 4" cast iron pipe coming up to the attic space, obviously for venting.  Someone, I don't know who or what they were thinking, has a 2" PVC pipe running from it through the roof.  Is this legal?  I know with drainage it would be a no-no to go from 4" to 2", but we are talking about gasses, so it isn't quite the same thing.

Does anyone know FOR SURE?

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Posted by: Ron Johnson <l0c0l0b0@hotmail.com>
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