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General Administration — ICC M1 Practice Questions

12 questions · 10% of the ICC M1 exam

Worked questions

1. A new residential building is being constructed with a natural gas furnace. According to the 2024 International Residential Code (IRC), what is the minimum clearance required between the furnace and any combustible material?

  • A6 inches
  • 12 inches
  • C18 inches
  • D24 inches

Exam tip

Familiarize yourself with the specific clearances required for different types of heating equipment.

Why B is correct

The correct answer is that the minimum clearance required between the furnace and any combustible material is 12 inches (IRC Section M1504.1). This requirement is to ensure that the furnace can operate safely without the risk of fire. Options A, C, and D are not the correct minimum clearances as specified by the IRC.

2. A residential building is being constructed with a forced-air heating system. Which of the following is a required component of the system, according to the 2024 International Residential Code?

  • AA gas-fired water heater
  • BA central air conditioning unit
  • CA gas-fired boiler
  • A direct venting gas furnace

Exam tip

Always check for the specific requirements of the heating system as outlined in the code.

Why D is correct

The 2024 IRC requires a direct venting gas furnace for a forced-air heating system to ensure safe combustion and exhaust. The other options are not required components for the heating system.

3. A residential building is being constructed with an oil-fired boiler. Which of the following is a requirement for the installation of the boiler according to the 2024 International Residential Code (IRC)?

  • AThe boiler must be installed in a room with a minimum ceiling height of 7 feet.
  • BThe boiler must be installed at least 3 feet away from any combustible material.
  • The boiler must be equipped with a low-water cutoff switch.
  • DThe boiler must be installed in a location that is easily accessible for maintenance.

Exam tip

Always check for specific requirements for the type of fuel used in the heating equipment.

Why C is correct

The correct answer is that the boiler must be equipped with a low-water cutoff switch (IRC Section M1503.2). This safety feature prevents the boiler from operating when the water level is too low, which can lead to damage and potential fires. Options A, B, and D are not specific requirements for the installation of an oil-fired boiler according to the IRC.

4. A residential building is equipped with a natural draft venting system for a gas furnace. Which of the following is a requirement for the venting system, according to the 2024 IRC?

  • AA minimum vent diameter of 6 inches
  • BA minimum vent diameter of 8 inches
  • A minimum vent diameter of 10 inches
  • DA minimum vent diameter of 12 inches

Exam tip

Check the code for the specific vent diameter requirements for different types of venting systems.

Why C is correct

The 2024 IRC specifies a minimum vent diameter of 10 inches for natural draft venting systems to ensure proper draft and exhaust of the furnace.

5. An inspector is checking the combustion air supply for a gas furnace. Which of the following is a requirement for the combustion air supply, according to the 2024 IRC?

  • A minimum of 100 cubic feet per hour of air for each 10,000 Btu input
  • BA minimum of 150 cubic feet per hour of air for each 10,000 Btu input
  • CA minimum of 200 cubic feet per hour of air for each 10,000 Btu input
  • DA minimum of 250 cubic feet per hour of air for each 10,000 Btu input

Exam tip

Use the correct calculation for determining the required combustion air supply as per the code.

Why A is correct

The 2024 IRC requires a minimum of 100 cubic feet per hour of air for each 10,000 Btu input for the combustion air supply to ensure adequate air for combustion.

6. An inspector is verifying the installation of a power-ventilating fan in a bathroom. Which of the following is the minimum required air flow rate for the fan, according to the 2024 IRC?

  • A50 cubic feet per minute
  • B75 cubic feet per minute
  • 100 cubic feet per minute
  • D125 cubic feet per minute

Exam tip

Check the code for the specific air flow rate requirements for different types of ventilation fans.

Why C is correct

The 2024 IRC mandates a minimum air flow rate of 100 cubic feet per minute for power-ventilating fans in bathrooms to ensure effective ventilation.

7. During the inspection of an existing home, the inspector notices that the bathroom exhaust fan is not venting properly. Which of the following actions should the inspector take?

  • ARecommend the replacement of the exhaust fan with a higher CFM model.
  • Inspect the vent pipe for obstructions or leaks.
  • CInstall a carbon monoxide detector in the bathroom.
  • DAdvise the homeowner to run the fan for longer periods.

Exam tip

Always verify the proper installation and operation of ventilation systems during inspections.

Why B is correct

The correct answer is to inspect the vent pipe for obstructions or leaks (IRC Section M1503.3). Proper ventilation is essential to remove moisture and odors from the bathroom. Option A is a potential solution but not the immediate action to take during the inspection. Option C is a good practice but not the immediate solution to the problem. Option D is not a long-term solution to the ventilation issue.

4 more in the bank

Answers and explanations for these are in the app.

  • An inspector is conducting a routine inspection on a residential property. Which of the following is the minimum required ventilation rate for a bathroom, according to the 2024 IRC?
  • An inspector is reviewing the drawings for a new commercial building and notices that the fire alarm system does not comply with the requirements of the 2024 International Residential Code (IRC). Which of the following actions should the inspector take?
  • An inspector is reviewing the installation of a new heating appliance. Which of the following is a requirement for the clearance between the appliance and combustible materials, according to the 2024 IRC?
  • Which of the following is the correct method for testing fuel gas piping for leaks, as per the 2024 International Residential Code?

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