International Code Council Commercial Mechanical Inspector : M2

Exam Code: M2

Exam Name: Commercial Mechanical Inspector

Updated: Oct 07, 2026

Q & A: 52 Questions and Answers

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About International Code Council Commercial Mechanical Inspector : M2 Exam

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International Code Council M2 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: General Administration18%- Manufacturer's instructions and listings
- Code authority and enforcement
- Permits and inspections
- Plan review and documentation
Topic 2: Duct Systems12%- Duct installation and supports
- Duct construction and materials
- Dampers and access doors
- Insulation and sealing
Topic 3: Heating, Cooling & Water Heaters18%- HVAC equipment installation and clearance
- Water heaters and storage tanks
- Boilers and hydronic systems
- Heat pumps and cooling equipment
- Solar thermal systems
Topic 4: Fuel Supply Systems10%- Gas appliances and connections
- Fuel gas piping materials and installation
- Piping testing and inspection
- Pressure regulation and overpressure protection
Topic 5: Chimneys & Vents14%- Chimney construction and materials
- Factory-built chimneys and vents
- Vent systems and connections
- Clearances and termination requirements
Topic 6: Exhaust & Ventilation Systems20%- Makeup air systems
- Ventilation rates and outdoor air requirements
- Hazardous and special exhaust systems
- Commercial kitchen exhaust systems
Topic 7: Combustion Air8%- Combustion air requirements
- Confined spaces and equipment rooms
- Air supply and venting

International Code Council Commercial Mechanical Inspector Sample Questions:

Question #1

All exposed gas piping shall be kept above grade a minimum of _____ inches.

  • A. 8.5
  • B. 3.5
  • C. 6
  • D. 12
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

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Question #2

Termination of vents for appliances listed for and installed outdoors that incorporate integral venting shall:

  • A. be installed in accordance with the design professional's plans as approved by the local building official.
  • B. be installed in accordance with their listings and the manufacturer's installation instructions.
  • C. terminate not less than 5 feet vertically above the highest connected appliance draft hood outlet or flue collar.
  • D. terminate not less than 5 feet vertically above the lowest connected appliance draft hood outlet or flue collar.
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

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Question #3

Exhibit:

CEF-5 is a ceiling exhaust fan manufactured by:

  • A. Nutone
  • B. Markel
  • C. Carnes
  • D. G.E.
Reveal Solution  Discussion  0

Correct Answer: A  🗳️

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Question #4

Indoor combustion air shall be provided within:

  • A. 2 feet of the ceiling and 1 foot of the floor.
  • B. 2 feet of the ceiling and 2 feet of the floor.
  • C. 1 foot of the ceiling and 2 feet of the floor.
  • D. 1 foot of the ceiling and 1 foot of the floor.
Reveal Solution  Discussion  0

Correct Answer: D  🗳️

Question #5

Given: single-wall vent, which serves only one appliance, and has a height of 10 feet.
The maximum horizontal length permitted for a 5-inch diameter vent connector serving this vent is _____ feet.

  • A. 9
  • B. 7.5
  • C. 10
  • D. 5
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

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