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NATE Gas Heating (Air) Exam (Latest Update 2026 / 2027) 100% Verified Questions & Answers | Grade A
Question:
What are the two types of Direct burner ignition
Answer:
Hot surface and spark
Question:
What are the primary characteristics that determine flame stability
Answer:
Gas flow velocity and Burning speed
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Question:
Category I Furnace
Answer:
is a negative pressure venting non-condensing furnace, flue gas temp is atleast 140F and above
Question:
Category II furnace
Answer:
is a negative pressure venting condensing corrosion resistant furnace, flue gas temp is under 140F
Question:
Category III furnace
Answer:
Air tight, positive flue pressure , sealed combustion, temp over 140°f , inducer motor
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