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Updated: Aug 24, 2026
No. of Questions: 52 Questions & Answers with Testing Engine
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International Code Council M2 Exam Overview:
| Certification Vendor: | International Code Council (ICC) |
| Exam Name: | Commercial Mechanical Inspector M2 Exam |
| Exam Number: | M2 |
| Passing Score: | 75 (scaled score) |
| Certificate Validity Period: | 3 years |
| Exam Price: | $219 (ICC members), $249-$320 (non-members) |
| Real Exam Qty: | 50 |
| Related Certifications: | Commercial Building Inspector Commercial Plumbing Inspector Commercial Electrical Inspector |
| Exam Duration: | 120 minutes |
| Exam Format: | Multiple-choice, Open-book |
| Available Languages: | English |
| Recommended Training: | ICC Code Resources ICC Official Training |
| Exam Registration: | Pearson VUE Scheduling ICC Official Registration |
| Sample Questions: | International Code Council M2 Sample Questions |
| Exam Way: | Onsite at Pearson VUE test centers; Online remote proctoring via ICC PRONTO |
| Pre Condition: | No mandatory prerequisites; recommended knowledge of International Mechanical Code (IMC) and International Fuel Gas Code (IFGC) |
| Official Syllabus URL: | https://www.iccsafe.org/certification/certification-exams/m2-commercial-mechanical-inspector/ |
International Code Council M2 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| General Administration | 18% | - Code authority and enforcement - Manufacturer's instructions and listings - Plan review and documentation - Permits and inspections |
| Chimneys & Vents | 14% | - Clearances and termination requirements - Chimney construction and materials - Vent systems and connections - Factory-built chimneys and vents |
| Duct Systems | 12% | - Duct construction and materials - Duct installation and supports - Insulation and sealing - Dampers and access doors |
| Combustion Air | 8% | - Combustion air requirements - Air supply and venting - Confined spaces and equipment rooms |
| Fuel Supply Systems | 10% | - Piping testing and inspection - Pressure regulation and overpressure protection - Fuel gas piping materials and installation - Gas appliances and connections |
| Exhaust & Ventilation Systems | 20% | - Hazardous and special exhaust systems - Makeup air systems - Commercial kitchen exhaust systems - Ventilation rates and outdoor air requirements |
| Heating, Cooling & Water Heaters | 18% | - Solar thermal systems - HVAC equipment installation and clearance - Boilers and hydronic systems - Water heaters and storage tanks - Heat pumps and cooling equipment |
International Code Council Commercial Mechanical Inspector Sample Questions:
1. The minimum size for access openings for fire dampers shall be:
A) adequate to permit maintenance and resetting of the damper.
B) one-half the diagonal of the access opening.
C) the same as the dimension of the duct.
D) 12 inches by 12 inches.
2. Exhibit:
CEF-5 is a ceiling exhaust fan manufactured by:
A) Nutone
B) Markel
C) G.E.
D) Carnes
3. Floor furnaces shall not be closer than _____ inches to the ground.
A) 12
B) [option text not fully visible in the material you sent]
C) [option text not fully visible in the material you sent]
D) [option text not fully visible in the material you sent]
4. Air mechanically exhausted from a room must be:
A) recirculated.
B) filtered.
C) discharged to the outdoors.
D) discharged into the attic.
5. Given: The listed clearance is 12 inches.
What would be the reduced clearance to combustibles, in inches, if the millboard is replaced with 24-gauge sheet metal?
A) 6
B) 4
C) 3
D) 2
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: A | Question # 3 Answer: C | Question # 4 Answer: C | Question # 5 Answer: B |
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