Page 1 of 68
INDIANA HVAC Journeyman EXAM 2026-2027
COMPLETE 300 QUESTIONS AND VERIFIED
SOLUTIONS LATEST UPDATE THIS YEAR
Indiana HVAC Journeyman Exam
FINAL EXAMINATION
Academic Year: 2026–2027
Exam Title: Indiana HVAC Journeyman Exam
Content: All Questions, Multiple-Choice Format with Rationales
Edition: Latest Update This Year
EXAMINATION INSTRUCTIONS
This examination evaluates knowledge of HVAC system installation, ventilation, combustion air,
mechanical codes, and safety compliance.
Each question has multiple-choice options (A–D). Choose the best answer.
Rationales are provided to reinforce understanding of correct answers.
Answer all questions based on IMC, NFPA, and industry standards.
,Page 2 of 68
EXAM COVERAGE
• Combustion air requirements and mechanical ventilation
• Minimum duct material thicknesses and construction
• Oil-fired appliance installation and oil tank requirements
• Steam boiler and pump discharge valve requirements
• Hydrogen system installation standards
• Unit heater installation
• Attic access and appliance removal
EXAM QUESTIONS
Question 1 – Combustion Air via Mechanical Ventilation
Where combustion air is provided by the building's mechanical ventilation system, the system
must provide the specified combustion air rate in _________ the required ventilation air.
A) substitution for
B) addition to
C) less than
D) independent of
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Correct Answer:
B) addition to
Rationale:
Combustion air provided mechanically must be in addition to the required ventilation air to
ensure appliances operate safely and effectively without compromising indoor air quality.
Question 2 – Minimum Duct Thickness for Residential Round Ducts
The minimum galvanized steel sheet metal thickness for a round duct 10 inches in diameter in
single dwelling units at 1 inch static pressure is:
A) 0.010 inches
B) 0.013 inches
C) 0.015 inches
D) 0.018 inches
Correct Answer:
B) 0.013 inches
Rationale:
IMC and ASHRAE standards specify a minimum thickness of 0.013 inches for a 10-inch round
duct under 1-inch static pressure for residential use.
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Question 3 – Combustion Air for Oil-Fired Appliances
______ appliances must be provided with combustion air in accordance with NFPA 31.
A) Gas-fired
B) Electric
C) Oil-fired
D) Solid fuel
Correct Answer:
C) Oil-fired
Rationale:
NFPA 31 governs oil-fired appliances, which require proper combustion air to prevent
incomplete combustion and carbon monoxide hazards.
Question 4 – Electrical Equipment Cooling
Electrical equipment that depends on the natural circulation of air and _________ for cooling of
exposed surfaces must be installed so that room airflow over such surfaces is not prevented by
walls or adjacent equipment.
A) conduction principles
B) convection principles
INDIANA HVAC Journeyman EXAM 2026-2027
COMPLETE 300 QUESTIONS AND VERIFIED
SOLUTIONS LATEST UPDATE THIS YEAR
Indiana HVAC Journeyman Exam
FINAL EXAMINATION
Academic Year: 2026–2027
Exam Title: Indiana HVAC Journeyman Exam
Content: All Questions, Multiple-Choice Format with Rationales
Edition: Latest Update This Year
EXAMINATION INSTRUCTIONS
This examination evaluates knowledge of HVAC system installation, ventilation, combustion air,
mechanical codes, and safety compliance.
Each question has multiple-choice options (A–D). Choose the best answer.
Rationales are provided to reinforce understanding of correct answers.
Answer all questions based on IMC, NFPA, and industry standards.
,Page 2 of 68
EXAM COVERAGE
• Combustion air requirements and mechanical ventilation
• Minimum duct material thicknesses and construction
• Oil-fired appliance installation and oil tank requirements
• Steam boiler and pump discharge valve requirements
• Hydrogen system installation standards
• Unit heater installation
• Attic access and appliance removal
EXAM QUESTIONS
Question 1 – Combustion Air via Mechanical Ventilation
Where combustion air is provided by the building's mechanical ventilation system, the system
must provide the specified combustion air rate in _________ the required ventilation air.
A) substitution for
B) addition to
C) less than
D) independent of
,Page 3 of 68
Correct Answer:
B) addition to
Rationale:
Combustion air provided mechanically must be in addition to the required ventilation air to
ensure appliances operate safely and effectively without compromising indoor air quality.
Question 2 – Minimum Duct Thickness for Residential Round Ducts
The minimum galvanized steel sheet metal thickness for a round duct 10 inches in diameter in
single dwelling units at 1 inch static pressure is:
A) 0.010 inches
B) 0.013 inches
C) 0.015 inches
D) 0.018 inches
Correct Answer:
B) 0.013 inches
Rationale:
IMC and ASHRAE standards specify a minimum thickness of 0.013 inches for a 10-inch round
duct under 1-inch static pressure for residential use.
, Page 4 of 68
Question 3 – Combustion Air for Oil-Fired Appliances
______ appliances must be provided with combustion air in accordance with NFPA 31.
A) Gas-fired
B) Electric
C) Oil-fired
D) Solid fuel
Correct Answer:
C) Oil-fired
Rationale:
NFPA 31 governs oil-fired appliances, which require proper combustion air to prevent
incomplete combustion and carbon monoxide hazards.
Question 4 – Electrical Equipment Cooling
Electrical equipment that depends on the natural circulation of air and _________ for cooling of
exposed surfaces must be installed so that room airflow over such surfaces is not prevented by
walls or adjacent equipment.
A) conduction principles
B) convection principles
