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International Code Council M2 : Commercial Mechanical Inspector

M2 real exams

Exam Code: M2

Exam Name: Commercial Mechanical Inspector

Updated: Jun 15, 2026

Q & A: 52 Questions and Answers

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International Code Council Commercial Mechanical Inspector Sample Questions:

1. A cooling system with a condensate disposal system:

A) shall have all horizontal sections of drain piping installed with a minimum of 1/4 inch per foot slope.
B) shall not be less than 3/4-inch PVC pipe or equivalent approved material.
C) 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.
D) shall be made of an approved pipe and be at least 1/2-inch in diameter.


2. What is the minimum distance required between a combustion air opening at the exterior of a building and a lot line?

A) 3 feet
B) 8 feet
C) 10 feet
D) 2 feet


3. For gas piping installations, which of the following is an acceptable joining method for polyethylene (PE) pipe?

A) Compression coupling
B) Solvent cement
C) Threaded coupling
D) Rubber cement


4. 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) 7.5
B) 5
C) 9
D) 10


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) 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.
C) To ensure that the project is completed in a timely manner.
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.


Solutions:

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

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