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A building at moderate altitude has appliances with manufacturer derating instructions and a gas utility heating value different from the table assumption. What is the best sizing practice?
Ignore altitude because pipe sizing tables already cover every location.
Use the locally applicable heating value, appliance input/derating information, and approved sizing method rather than blindly copying nominal sea-level examples.
Always reduce pipe size at altitude because burner input is lower.
Use LP-gas tables because altitude affects natural gas only.
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