NC Fuel Gas Code 2009 Question?

[Stephen260B]

Vent Connectors sizes.

Why does 503.10.9 say that the horizontal length of a single wall connector can be 75% of the vent height, but 504.3.2 says that the max vent connector horizontal length shall be 1.5 feet per inch of the connector diameter? Any clarification about vents and connectors would be appreciated since I'm studying for H-3 Test.

Thanks

[mgenius33]

Vent Connectors sizes.

Why does 503.10.9 say that the horizontal length of a single wall connector can be 75% of the vent height, but 504.3.2 says that the max vent connector horizontal length shall be 1.5 feet per inch of the connector diameter? Any clarification about vents and connectors would be appreciated since I'm studying for H-3 Test.

Thanks

I believe section 503 deals with general regulations, and section 504 deals with Category 1 appliances, specifically.

[second opinion]

Vent Connectors sizes.

Why does 503.10.9 say that the horizontal length of a single wall connector can be 75% of the vent height, but 504.3.2 says that the max vent connector horizontal length shall be 1.5 feet per inch of the connector diameter? Any clarification about vents and connectors would be appreciated since I'm studying for H-3 Test.

Thanks

limits the overal maximum connector length that could be calculated by504.3.2