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International Code Council M2

M2

Exam Code: M2

Exam Name: Commercial Mechanical Inspector

Updated: Aug 22, 2026

Q & A: 52 Questions and Answers

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About International Code Council M2 Exam

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International Code Council M2 Exam Syllabus Topics:

SectionWeightObjectives
Heating, Cooling & Water Heaters18%- Heat pumps and cooling equipment
- Water heaters and storage tanks
- Boilers and hydronic systems
- Solar thermal systems
- HVAC equipment installation and clearance
Combustion Air8%- Air supply and venting
- Combustion air requirements
- Confined spaces and equipment rooms
Fuel Supply Systems10%- Fuel gas piping materials and installation
- Pressure regulation and overpressure protection
- Piping testing and inspection
- Gas appliances and connections
General Administration18%- Code authority and enforcement
- Manufacturer's instructions and listings
- Permits and inspections
- Plan review and documentation
Chimneys & Vents14%- Factory-built chimneys and vents
- Chimney construction and materials
- Clearances and termination requirements
- Vent systems and connections
Duct Systems12%- Dampers and access doors
- Duct construction and materials
- Insulation and sealing
- Duct installation and supports
Exhaust & Ventilation Systems20%- Hazardous and special exhaust systems
- Makeup air systems
- Ventilation rates and outdoor air requirements
- Commercial kitchen exhaust systems

International Code Council Commercial Mechanical Inspector Sample Questions:

1. The minimum size for access openings for fire dampers shall be:

A) one-half the diagonal of the access opening.
B) adequate to permit maintenance and resetting of the damper.
C) 12 inches by 12 inches.
D) the same as the dimension of the duct.


2. Shutoff valves in plastic pipe ground-source heat pump loop systems shall be installed on both sides of which one of the following?

A) Heat-fusion joints
B) Change-in-material joints
C) Pressure-reducing valves
D) Expansion tanks


3. Horizontal terminations for mechanical draft systems that are adjacent to public walkways shall be located a minimum of _____ feet above grade.

A) 9
B) 10
C) 8
D) 7


4. Pipe and duct insulation can be used within plenums except:

A) where the flame spread index is not more than 25.
B) where the assembly has been tested to ASTM E84.
C) where the assembly has been tested to ASTM B84.
D) where the assembly has been tested to UL 723.


5. What is the maximum distance allowed below the design flood elevation from which ventilation may be obtained?

A) 1 foot
B) 6 inches
C) 0 inches
D) 2 feet


Solutions:

Question # 1
Answer: B
Question # 2
Answer: C
Question # 3
Answer: D
Question # 4
Answer: C
Question # 5
Answer: A

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