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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. During an existing gas cooking-appliance inspection, the approved combustion-air design relies on a dedicated opening. A later cover obstructs that opening so its free area is below the approved design requirement, and no alternate air-supply method has been provided. Which observed condition explains the air-supply deficiency?

  • AThe appliance nameplate color
  • The restricted combustion-air opening
  • CThe room’s paint finish
  • DThe kitchen being above the first floor

Where to look it up

https://codes.iccsafe.org/content/IRC2024P2/appendix-cc-recommended-procedure-for-safety-inspection-of-an-existing-appliance-installation

Why B is correct

The observed restriction reduces the air path required by the stated design. Appendix CC104, item 3, recommends checking nondirect-vent appliance combustion-air openings and ducts for blockage and restriction. The original question supplied no observations that could distinguish an undersized opening from other causes; this version provides that evidence. The appendix is an inspection guide, not a universal opening-size formula or an automatically adopted mandatory appendix. Confirm the actual combustion-air design, appliance instructions and applicable requirements before selecting a correction. Source: https://codes.iccsafe.org/content/IRC2024P2/appendix-cc-recommended-procedure-for-safety-inspection-of-an-existing-appliance-installation

3. For a Carrier 59SC6A furnace, Table 2 lists the top clearance from combustible material as 1 inch. An unprotected combustible surface is 3/4 inch above the top of the furnace. What is the clearance finding under this listed requirement?

  • AAccept because the rear clearance is zero
  • BAccept because all sides have the same clearance
  • The top clearance is short by 1/4 inch
  • DThe top clearance is short by 3/4 inch

Where to look it up

https://www.shareddocs.com/hvac/docs/1009/Public/0A/59SC6A-01SI.pdf

Why C is correct

Compare the specified top clearance with the measured top clearance: 1 − 0.75 = 0.25 inch short. A clearance listed for another face does not replace the top requirement. Source: https://www.shareddocs.com/hvac/docs/1009/Public/0A/59SC6A-01SI.pdf

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?

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