Measure Guideline: Combustion Safety for Natural Draft ...
2014-4-17 · under negative pressure. Residential draft hood-equipped water heaters and boilers, though not categorized, are included in this Measure Guideline. The current minimum code in this area is the ANSI z332.1 National Fuel Gas Code (NFGC), which is also published by the National Fire Protection Association as NFPA 54. The
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