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Cutting a hole in existing vent pipe
June 13, 2018
6:15 pm
dweed@coloradocode.net
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April 29, 2015
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I might quote him section 502.2 of the 2015 IFGC as well, which requires him to use connectors when connecting appliances to the vertical vent. He is clearly trying to get by without buying a couple fittings!

June 12, 2018
4:07 pm
fgrable@iccsafe.org
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April 6, 2015
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Using the 2015 edition of the IFGC as a reference, Section 504.3.9 implies that there will be either tee or wye fittings at the juncture of where the two vent connectors come together and become the common vent. Sizing of the common vent is by the tables….note that only the Type B double wall vent table (for two or more appliances) has common vent sizing….

June 12, 2018
7:53 am
dvandevoorde@jeffcitymo.org
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March 28, 2018
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I have a contractor that cut a 3" hole in the existing 6" single wall vent pipe for the furnace to pick up the water heater vent 

He tabbed it and put 3 screws to hold it and sealed the edges with high temp caulk.

I cannot a code section that says you have to use a tee or wye.

Can I get some insight. I know it is not right but need a code section to reference.

Thanks