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ICC Commercial Mechanical Inspector M2 exam
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR-JUST RELEASED
ICC Commercial Mechanical Inspector Exam (M2). Each question includes the answer and
a summarized rationale based on the International Mechanical Code (IMC) and International Fuel Gas
Code (IFGC) , the primary reference materials for the exam. The questions cover all exam content areas:
General Administration (18%), Heating/Cooling/Water Heaters (18%), Exhaust and Ventilation Systems
(20%), Duct Systems (12%), Chimneys and Vents (14%), Fuel Supply Systems (10%), and Combustion Air
(8%) .
1. What is the primary code reference for the ICC Commercial Mechanical Inspector (M2) exam?
A) International Building Code (IBC)
B) International Mechanical Code (IMC)
C) International Fire Code (IFC)
D) International Energy Conservation Code (IECC)
Answer: B
Rationale: The IMC is the primary code for the M2 exam, covering mechanical systems including HVAC,
exhaust systems, ductwork, and appliances .
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2. According to IMC Chapter 1, who has the authority to issue permits for mechanical work?
A) The property owner
B) The general contractor
C) The building official
D) The mechanical contractor
Answer: C
Rationale: The building official is authorized by the code to issue permits and enforce mechanical code
provisions.
3. What is the minimum passing score for the ICC M2 Commercial Mechanical Inspector exam?
A) 60% (30 correct answers)
B) 65% (33 correct answers)
C) 70% (35 correct answers)
D) 75% (38 correct answers)
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Answer: C
Rationale: The M2 exam has 50 multiple-choice questions, and a passing score is 70%, which is 35
correct answers out of 50 .
4. What is the time limit for the ICC M2 exam?
A) 1 hour
B) 1.5 hours
C) 2 hours
D) 3 hours
Answer: C
Rationale: The M2 exam is open-book with a 2-hour time limit .
5. Which edition of the IMC is currently referenced for ICC certification exams as of 2025?
A) 2018
B) 2021
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C) 2024
D) 2015
Answer: B
Rationale: ICC exams are currently based on the 2021 editions of the I-Codes, including the IMC and
IFGC .
6. Products or materials not specifically detailed in the IMC must be:
A) Automatically prohibited
B) Approved by the building official and installed according to their listing
C) Allowed only if they are less expensive
D) Installed without any inspection
Answer: B
Rationale: Products not detailed in the code must be approved by the building official and installed
according to their listing. The building official has the authority to approve alternate materials and
methods .
ICC Commercial Mechanical Inspector M2 exam
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR-JUST RELEASED
ICC Commercial Mechanical Inspector Exam (M2). Each question includes the answer and
a summarized rationale based on the International Mechanical Code (IMC) and International Fuel Gas
Code (IFGC) , the primary reference materials for the exam. The questions cover all exam content areas:
General Administration (18%), Heating/Cooling/Water Heaters (18%), Exhaust and Ventilation Systems
(20%), Duct Systems (12%), Chimneys and Vents (14%), Fuel Supply Systems (10%), and Combustion Air
(8%) .
1. What is the primary code reference for the ICC Commercial Mechanical Inspector (M2) exam?
A) International Building Code (IBC)
B) International Mechanical Code (IMC)
C) International Fire Code (IFC)
D) International Energy Conservation Code (IECC)
Answer: B
Rationale: The IMC is the primary code for the M2 exam, covering mechanical systems including HVAC,
exhaust systems, ductwork, and appliances .
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2. According to IMC Chapter 1, who has the authority to issue permits for mechanical work?
A) The property owner
B) The general contractor
C) The building official
D) The mechanical contractor
Answer: C
Rationale: The building official is authorized by the code to issue permits and enforce mechanical code
provisions.
3. What is the minimum passing score for the ICC M2 Commercial Mechanical Inspector exam?
A) 60% (30 correct answers)
B) 65% (33 correct answers)
C) 70% (35 correct answers)
D) 75% (38 correct answers)
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Answer: C
Rationale: The M2 exam has 50 multiple-choice questions, and a passing score is 70%, which is 35
correct answers out of 50 .
4. What is the time limit for the ICC M2 exam?
A) 1 hour
B) 1.5 hours
C) 2 hours
D) 3 hours
Answer: C
Rationale: The M2 exam is open-book with a 2-hour time limit .
5. Which edition of the IMC is currently referenced for ICC certification exams as of 2025?
A) 2018
B) 2021
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C) 2024
D) 2015
Answer: B
Rationale: ICC exams are currently based on the 2021 editions of the I-Codes, including the IMC and
IFGC .
6. Products or materials not specifically detailed in the IMC must be:
A) Automatically prohibited
B) Approved by the building official and installed according to their listing
C) Allowed only if they are less expensive
D) Installed without any inspection
Answer: B
Rationale: Products not detailed in the code must be approved by the building official and installed
according to their listing. The building official has the authority to approve alternate materials and
methods .
