NATE Gas Heating Final Exam 2025/2026 – Questions & Answers with Study Guide, Expert Verified Practice Exam (A+ Graded)

NATE GAS HEATING FINAL EXAM

2025/2026(QUESTIONS & ANSWERS)WITH STUDY

GUIDE EXPERT VERIFIED FOR GUARANTEED

PASS||ALREADY GRADED A+




What type of furnace moves warm air through the

conditioned space without a fan?

a. Gravity

b. Horizontal

c. Lowboy

d. Upflow - ANSWER-a (Gravity)




Furnace heat exchangers generally are made of .

,a. ceramic

b. copper

c. plastic

d. steel - ANSWER-d (steel)

In a modern gas furnace, the component that separates

the combustion gases from the supply air is the .

a. gas valve

b. heat exchanger

c. inducer fan

d. plenum box - ANSWER-b (heat exchanger)

,What does AFUE stand for?

a. Actual Fuel Usage Efficiency

b. Annual Fuel Utilization Efficiency

c. Annual Furnace Usage Equivalency

d. Approved Fuel Usage Estimate - ANSWER-b (Annual

Fuel Utilization Efficiency)




The main purpose of a secondary heat exchanger is to

.

a. evaporate the flue gases

b. provide a backup containment

c. remove additional heat from the flue gases

d. reverse the primary air flow - ANSWER-c (remove

additional heat from the flue gases)

, Which gas commonly used as a fuel in gas furnaces is

heavier than air?

a. butane

b. isobutene

c. methane

d. propane - ANSWER-d (propane)




Which grade of fuel oil is most commonly used in

residential furnaces?

a. 1

b. 2

c. 3

d. 4 - ANSWER-b (2)