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Re: Boiler Vent Connection Diameter


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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
http://www.weil-mclain.com/downloads/literature/gold/wgoboilermanual.pdf
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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