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Posted by HeatPro on September 23, 2009 at 10:08:07:
In Reply to: Boiler Vent Connection Diameter posted by cydown on September 23, 2009 at 07:00:39:
Weil does have an explanation for reducing the vent when the burner output matches the ability to use the smaller size in the installation manual. They use the same boiler casting for smaller outputs.
As far as convincing an inspector ...