Gas Heat ESCO Practice Exam

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What is the term for the air mixed with Natural Gas in the burner?

Combustion Air
Draft Air
Primary Air
Secondary Air

The correct answer is: Primary Air

Natural Gas requires a specific mixture of gases in order to properly combust and produce heat. This mixture is called "Primary Air". The addition of any other type of air would either hinder or not generate enough heat for the burner to work efficiently. "Combustion Air" introduces too much air into the mix, lowering the heat produced. "Draft Air" and "Secondary Air" are also not the correct terms because they do not accurately describe the type of air needed for the burner.