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Posted by HeatPro on September 26, 2009 at 20:58:50:
In Reply to: Re: Boiler Vent Connection Diameter posted by cydown on September 25, 2009 at 06:17:04:
While NFPA code says that, NFPA code is a suggestion, not a law. The boiler manufacturer instructions are used for code in local areas.
The chart on page 12 of
shows that a 5-inch breeching diameter is the minimum size for WGO-2 and 3 (and WTGO-3); but not for WGO 4, which must use the 6-inch.
It will, in the end, be the choice of the local inspector that settles the fire marshal, CO, and insurance dispute.
"Use vent material approved by local codes for
oil-fired burners. IN THEIR ABSENCE, refer to:
— NFPA 31, Installation of Oil-Burning Equipment.
— NFPA 211, Standard for Chimneys, Fireplaces,
Vents and Solid Fuel Burning Appliances.
— In Canada, refer to CSA B139, Installation
Code for Oil-Burning Equipment.
• NFPA 211 requires chimney to be lined before
connected to boiler."
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