International Code Council M2 : Commercial Mechanical Inspector

M2 real exams

Exam Code: M2

Exam Name: Commercial Mechanical Inspector

Updated: Sep 17, 2026

Q & A: 52 Questions and Answers

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International Code Council M2 Exam Syllabus Topics:

SectionObjectives
Hydronic Piping and Refrigeration- Hydronic Systems
  • 1. Piping Installation
  • 2. Pressure Testing
- Refrigeration
  • 1. Refrigerant Piping
  • 2. Safety Controls
Chimneys and Vents- Vent Systems
  • 1. Chimney Clearances
  • 2. Vent Sizing
- Connectors and Terminations
  • 1. Termination Requirements
  • 2. Vent Connectors
Ventilation and Exhaust Systems- Commercial Kitchens
  • 1. Grease Ducts
  • 2. Kitchen Exhaust Hoods
- Ventilation
  • 1. Exhaust Air Systems
  • 2. Mechanical Ventilation
Duct Systems- Air Distribution
  • 1. Duct Insulation
  • 2. Plenums
- Duct Construction
  • 1. Dampers and Protection
  • 2. Materials and Installation
Heating and Cooling Systems- Heating Appliances
  • 1. Boilers
  • 2. Furnaces
  • 3. Water Heaters
- Cooling Systems
  • 1. Refrigeration Equipment
  • 2. Cooling Appliances
Combustion Air and Fuel Supply- Fuel Supply Systems
  • 1. Fuel Oil Systems
  • 2. Fuel Gas Piping
- Combustion Air
  • 1. Indoor and Outdoor Air Requirements
  • 2. Combustion Air Openings
General Administration- Code Scope and Administration
  • 1. Referenced Standards
  • 2. Definitions
  • 3. Permits and Inspections
Materials and Specifications- Approved Materials
  • 1. Installation Standards
  • 2. Equipment Labeling

International Code Council Commercial Mechanical Inspector Sample Questions:

Question #1

The exhaust outlet for a clothes dryer is required to be equipped with:

  • A. a temperature limit control device that will automatically shut off the system at a temperature of 250°F.
  • B. a backdraft damper.
  • C. an automatically controlled volume damper.
  • D. a corrosion-resistant screen of 1/4-inch mesh.
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

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Question #2

A low-pressure steam heating boiler is a boiler furnishing a maximum steam pressure of _____ psi.

  • A. 80
  • B. [option text not fully visible in the material you sent]
  • C. 15
  • D. [option text not fully visible in the material you sent]
Reveal Solution  Discussion  0

Correct Answer: C  🗳️

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Question #3

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. 5
  • B. 10
  • C. 9
  • D. 7.5
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Correct Answer: D  🗳️

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Question #4

An 8-inch Type B venting system with a listed vent cap must terminate a minimum of _____ feet above the flat roof through which it passes.

  • A. 5
  • B. 1
  • C. 4
  • D. 2
Reveal Solution  Discussion  0

Correct Answer: B  🗳️

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Question #5

Why are two or more sets of construction documents, engineering calculations, diagrams, and other data required to be submitted with each application for a permit?

  • A. One set will be retained by the code official, and the other will be returned to the applicant and kept on the job site for reference while construction is in progress.
  • B. To ensure that the project is completed in a timely manner.
  • C. All sets are to be retained by the code official in order to have a spare set of construction documents for use by any subcontractors.
  • D. All sets of documents are to be kept by the code official, and at least one set will serve as a backup set of documents in case the other is lost or misplaced.
Reveal Solution  Discussion  0

Correct Answer: A  🗳️

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