Some of the significant revisions in the 2006 National Fuel Gas Code include expanded pipe sizing tables and new rooftop support requirements; permitting Type B vents to be installed in outdoor insulated chases and revising vent-connector length limits; and new requirements for appliances located in attics, new options for appliance shut-off valve locations, and revised appliance connections.

The National Fuel Gas Code provides criteria on most aspects of fuel-gas installations on consumer premises. Coverage includes gas piping materials, system design, installation and inspections; combustion air; equipment venting; and specific equipment installation criteria.