ICC Commercial Mechanical Inspector (M2) Practice Test
Build your confidence for ICC Commercial Mechanical Inspector (M2). Practice the concepts, understand the answers, and strengthen your knowledge one question at a time.
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Exam overview and details
These independent practice questions target the ICC Commercial Mechanical Inspector exam, exam ID M2. The exam has 50 multiple-choice questions, a 2-hour limit, and an open-book format. This practice material is not produced by ICC. Administered by International Code Council as a 50 multiple-choice questions; 2 hours; open book. format exam. Key domains include Exhaust and Ventilation Systems, General Administration, Heating/Cooling/Water Heaters and Chimneys and Vents.
Sample Questions
Choose an answer and explore the explanation to see how practice works.
A boiler low-water cutoff is installed but bypassed during startup and left jumped out after testing. What should the inspector require?
A mechanical room contains a gas-fired boiler that lacks the product label because the cabinet was repainted. The contractor has an invoice but no listing data. What is the inspector's correct position?
A permit application includes a heating load summary but no equipment schedule, venting method, or fuel-gas piping layout for a gas furnace replacement in a small commercial suite. Which item is most properly required before permit issuance?
A grease duct cleanout access panel is omitted above a change in direction because the ceiling is accessible. Which correction is required?
A small packaged refrigeration system is below the refrigerant quantity threshold, but its relief discharge terminates inside an occupied storage room. Which issue remains?
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Exam insights and study advice
The M2 exam covers general administration; heating, cooling, and water heaters; exhaust and ventilation systems; duct systems; combustion air; chimneys and vents; and fuel supply systems.
What this exam covers
Use the published domain weights to plan your study. Practice results do not predict your certification exam score.
01Exhaust and Ventilation Systems
Topics
- Ventilation Systems (6%)
- Hood and Kitchen Ventilation (8%)
- Hazardous Vapors/Emergency Exhaust System (2%)
- Product-Conveying Ventilation Systems (4%)
Learning objectives
- Ventilation Systems (6%)
- Hood and Kitchen Ventilation (8%)
- Hazardous Vapors/Emergency Exhaust System (2%)
- Product-Conveying Ventilation Systems (4%)
02General Administration
Topics
- Project Administration (4%)
- Public Information and Legal (3%)
- Plan Reading (6%)
- Manufacturer's Installation Instructions (5%)
Learning objectives
- Project Administration (4%)
- Public Information and Legal (3%)
- Plan Reading (6%)
- Manufacturer's Installation Instructions (5%)
03Heating/Cooling/Water Heaters
Topics
- Heating Equipment (6%)
- Water Heaters and Boilers (4%)
- Cooling and Refrigeration (2%)
- Other Systems (2%)
- Heat Pumps and Solar Thermal Energy (4%)
Learning objectives
- Heating Equipment (6%)
- Water Heaters and Boilers (4%)
- Cooling and Refrigeration (2%)
- Other Systems (2%)
- Heat Pumps and Solar Thermal Energy (4%)
04Chimneys and Vents
Topics
- Venting of Fuel-Burning Appliances (8%)
- Chimney and Vent Connectors (6%)
Learning objectives
- Venting of Fuel-Burning Appliances (8%)
- Chimney and Vent Connectors (6%)
05Duct Systems
Topics
- Duct Construction and Installation (4%)
- Duct and Plenum Use and Application (2%)
- Smoke and Fire Dampers (6%)
Learning objectives
- Duct Construction and Installation (4%)
- Duct and Plenum Use and Application (2%)
- Smoke and Fire Dampers (6%)
06Fuel Supply Systems
Topics
- Fuel Supply Installation and Sizing (8%)
- Fuel System Connections (2%)
Learning objectives
- Fuel Supply Installation and Sizing (8%)
- Fuel System Connections (2%)
07Combustion Air
Topics
- Combustion Air (8%)
Learning objectives
- Combustion Air (8%)