NATE Gas Heating (Air) Exam (Latest Update 2026 / 2027) 100% Verified Questions & Answers | Grade A

NATE Gas Heating (Air) Exam
(Latest Update ) 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

, 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