Exam M2

Commercial Mechanical Inspector

Inspecting mechanical systems installed in commercial applications and regulated by the International Mechanical Code, including locating specific sections to interpret regulations accurately.

Questions: 50
Time limit: 120 min
Per question: 144 sec
Book: Open

Where the marks sit

Exhaust and Ventilation Systems carries 20 percent on its own. Study time should follow this, not the order of the chapters.

03 Exhaust and Ventilation Systems20%

01 General Administration15%

02 Heating, Cooling and Water Heaters15%

05 Combustion Air14%

06 Chimneys and Vents14%

04 Duct Systems12%

07 Fuel Supply Systems10%

Transcribed from ICC's published M2 content outline. Areas sum to 100 percent.

Full topic breakdown

Area	Topic	Weight
0101	Project Administration	2%
0102	Public Information and Legal	2%
0103	Plan Reading	6%
0104	Manufacturer's Installation Instructions	5%
0201	Heating Equipment	5%
0202	Water Heaters and Boilers	4%
0203	Cooling and Refrigeration	4%
0204	Other Systems	2%
0301	Ventilation Systems	6%
0302	Hood and Kitchen Ventilation	7%
0303	Hazardous Vapors and Emergency Exhaust Systems	3%
0304	Product-Conveying Ventilation Systems	4%
0401	Duct Construction and Installation	4%
0402	Duct and Plenum Use and Application	3%
0403	Smoke and Fire Dampers	5%
0501	Combustion Air	14%
0601	Venting of Fuel-Burning Appliances	8%
0602	Chimney and Vent Connectors	6%
0701	Fuel Supply Installation and Sizing	7%
0702	Fuel System Connections	3%

Before you book: the ICC passing score is a scaled 75, not 75 percent.

Common questions

How many questions are on the ICC M2 exam?

The M2 Commercial Mechanical Inspector exam has 50 multiple-choice questions with a 120-minute limit, which works out to about 144 seconds per question.

Is the ICC M2 exam open book?

Yes. The M2 is an open-book exam. The constraint is time rather than recall: you have roughly 144 seconds per question including the lookup.

How long is the ICC M2 exam?

120 minutes, or 2 hours, for 50 questions.

What is on the ICC M2 exam?

7 topic areas. The heaviest is Exhaust and Ventilation Systems at 20 percent, followed by General Administration at 15 percent. The full weighting is published by ICC and reproduced on this page.

Which code book do I need for the M2 exam?

The International Mechanical Code is the primary reference. Confirm the edition your jurisdiction has adopted, because adopted editions vary by state and the exam is written to a specific one.

The companion books