EstatePass

Combustion Air — ICC M1 Practice Questions

23 questions · 19% of the ICC M1 exam

Worked questions

1. A gas fireplace is being installed in a home under construction. The builder proposes to use a power-vent system to provide combustion air. Is this an acceptable solution?

  • Yes, it is an acceptable solution
  • BNo, it is not an acceptable solution
  • CIt depends on the size of the fireplace
  • DIt depends on the local building codes

Exam tip

Know the code requirements for combustion air for different types of appliances, including fireplaces.

Why A is correct

According to Section M1501.2.3 of the 2024 International Residential Code, a power-vent system can be used to provide combustion air for a gas fireplace. This is an acceptable solution as long as the system is properly installed and maintained.

2. A gas stove in an existing building is not providing adequate combustion air. What is the most likely cause of this issue, as per your knowledge of combustion air requirements?

  • AThe building is too small for the stove
  • The combustion air opening is too small
  • CThe stove is not properly installed
  • DThe building has insufficient natural ventilation

Exam tip

Understand the common issues that can arise with combustion air and how to identify them during an inspection.

Why B is correct

The correct answer is that the combustion air opening is too small, which is a common issue. The other options are less likely causes or not directly related to combustion air requirements.

3. A new fuel gas appliance is being installed in a residential building. What is the minimum clearance required between the appliance and an adjacent wall, as per Section M1801.4 of the 2024 International Residential Code?

  • A6 inches
  • B8 inches
  • 10 inches
  • D12 inches

Exam tip

Ensure you are aware of the clearances required around fuel gas appliances for safety.

Why C is correct

The correct answer is 10 inches, as per Section M1801.4 of the 2024 IRC. The other options are incorrect as they do not meet the code requirements for appliance clearances.

4. During an inspection of an existing building, you find that the combustion air ducts are not insulated. What is the minimum R-value required for these ducts, according to Section M1501.3.2 of the 2024 International Residential Code?

  • AR-3
  • BR-5
  • R-7
  • DR-9

Exam tip

Remember that the R-value for combustion air ducts is different from other ducts in the building.

Why C is correct

The correct answer is R-7, as per Section M1501.3.2 of the 2024 IRC. The other options are incorrect as they do not meet the code requirements for insulated combustion air ducts.

5. During the inspection of a fuel gas piping system, you notice that the piping is not properly supported. What is the minimum spacing required between supports for fuel gas piping, as per Section M1801.3 of the 2024 International Residential Code?

  • A4 feet
  • 6 feet
  • C8 feet
  • D10 feet

Exam tip

Supports for fuel gas piping must be installed at the correct spacing to ensure safety and compliance.

Why B is correct

The correct answer is 6 feet, as per Section M1801.3 of the 2024 IRC. The other options are incorrect as they do not meet the code requirements for fuel gas piping support spacing.

18 more in the bank

Answers and explanations for these are in the app.

  • A fuel gas piping system is being installed in a residential building. What is the minimum required wall thickness for fuel gas piping, as per Section M1801.2 of the 2024 International Residential Code?
  • A gas dryer is located in a room that is not directly vented to the outside. What action should be taken to ensure proper combustion air?
  • A gas furnace in an existing building is not providing adequate combustion air. What is the most common method to provide additional combustion air, as per Section M1501.2 of the 2024 International Residential Code?
  • A gas furnace is installed in a basement of a new residential building. The basement has no natural ventilation. What is the minimum amount of makeup air required per hour for this furnace?
  • A gas water heater is installed in a basement of a new residential building. What is the minimum required combustion air opening area, as per Section M1501.3.1 of the 2024 International Residential Code?
  • A home under construction has a gas stove installed in a kitchen without any windows. What is the minimum amount of makeup air required for this stove?
  • A new home is being built with a wood-burning fireplace. The builder wants to install a power-vent system for the fireplace. Is this an acceptable solution?
  • A new residential building has an electric water heater. Does this water heater require a separate combustion air supply?
  • A new residential building is being constructed with a natural gas fuel gas system. What is the minimum required wall thickness for the fuel gas piping?
  • A new residential building is equipped with a clothes dryer. What is the minimum ventilation area required for the dryer exhaust duct?
  • A residential building is being constructed in a cold climate zone. The building has a forced-air heating system. What is the minimum amount of combustion air required for this system?
  • A water heater in an existing building is not receiving adequate combustion air. What is the recommended location for a power-vent water heater to ensure proper combustion air, as per Section M1501.4 of the 2024 International Residential Code?
  • An existing building has a gas boiler that is not providing adequate combustion air. The room where the boiler is located has no windows. What is the best course of action?
  • During an inspection of an existing building, you notice that the water heater is located in a room that is not directly vented to the outside. What action should you take?
  • During an inspection of an existing residential building, you notice that the combustion air ducts are located in the attic. What is the code requirement for the insulation of these ducts?
  • You are inspecting a building with a gas boiler that is not providing adequate combustion air. What is the first step you should take?
  • You are inspecting an existing residential building and notice that the combustion air shutoff valves are not accessible. What action should you take?
  • You are inspecting the installation of fuel gas piping in an existing residential building. What is the code requirement for the clearance between fuel gas piping and electrical wiring?

Practice all 23 Combustion Air questions

Plus timed mock exams and a wrong book that follows you between the web and the app.

Start studying free

Other ICC M1 content areas