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International Code Council M2

M2

Exam Code: M2

Exam Name: Commercial Mechanical Inspector

Updated: Aug 20, 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
Duct Systems- Duct Construction
  • 1. Materials and Installation
  • 2. Dampers and Protection
- Air Distribution
  • 1. Duct Insulation
  • 2. Plenums
Materials and Specifications- Approved Materials
  • 1. Equipment Labeling
  • 2. Installation Standards
Heating and Cooling Systems- Heating Appliances
  • 1. Boilers
  • 2. Water Heaters
  • 3. Furnaces
- Cooling Systems
  • 1. Cooling Appliances
  • 2. Refrigeration Equipment
Chimneys and Vents- Connectors and Terminations
  • 1. Vent Connectors
  • 2. Termination Requirements
- Vent Systems
  • 1. Vent Sizing
  • 2. Chimney Clearances
General Administration- Code Scope and Administration
  • 1. Permits and Inspections
  • 2. Referenced Standards
  • 3. Definitions
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
Ventilation and Exhaust Systems- Commercial Kitchens
  • 1. Grease Ducts
  • 2. Kitchen Exhaust Hoods
- Ventilation
  • 1. Exhaust Air Systems
  • 2. Mechanical Ventilation

International Code Council Commercial Mechanical Inspector Sample Questions:

1. Which of the following is not a required mechanical inspection?

A) Final
B) Rough-in
C) Underground
D) Annual system test


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

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


3. An equipment shutoff valve shall be in the same room and not more than how many feet away from the appliance?

A) 7
B) 8
C) 6
D) 9


4. A cooling system with a condensate disposal system:

A) shall be made of approved corrosion-resistant material and shall not decrease in size from the drain pan connection to the place of condensate disposal.
B) shall be made of an approved pipe and be at least 1/2-inch in diameter.
C) shall not be less than 3/4-inch PVC pipe or equivalent approved material.
D) shall have all horizontal sections of drain piping installed with a minimum of 1/4 inch per foot slope.


5. Infrared radiant heaters shall be installed:

A) with clearances from combustible material in accordance with the manufacturer's installation instructions.
B) with a 6-ft. clearance on all sides.
C) in accordance with UL 1240.
D) in accordance with UL 2158.


Solutions:

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

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