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Exhaust Systems — ICC M1 Practice Questions

11 questions · 9% of the ICC M1 exam

Worked questions

1. A residential kitchen has a range hood that is designed to vent directly to the outdoors. What is the minimum required ventilation rate for this range hood?

  • A50 cubic feet per minute (CFM)
  • 100 cubic feet per minute (CFM)
  • C150 cubic feet per minute (CFM)
  • D200 cubic feet per minute (CFM)

Exam tip

Always refer to the specific section for the minimum ventilation rates required for different appliances.

Why B is correct

According to Section M1501.2.2.1 of the 2024 International Residential Code, the minimum required ventilation rate for a range hood that vents directly to the outdoors is 100 CFM. Option A is incorrect because it does not meet the minimum requirement. Options C and D are incorrect because they exceed the required ventilation rate.

2. An inspector is checking the suction capacity of an exhaust fan in a residential kitchen. The fan is designed to remove smoke and odors. What is the minimum required suction capacity for this fan according to the 2024 IRC?

  • A100 CFM
  • B150 CFM
  • 200 CFM
  • D250 CFM

Exam tip

Suction capacity is an important factor in the effectiveness of exhaust fans in removing contaminants from the air.

Why C is correct

The 2024 IRC requires a minimum suction capacity of 200 CFM for exhaust fans in kitchens to effectively remove smoke and odors. Options A, B, and D are incorrect as they do not meet the code requirement.

3. An inspector is reviewing the ductwork sizing for a residential building. The ducts are designed to supply air to a room that is 300 square feet. What is the minimum size of the supply duct required according to the 2024 IRC?

  • A4 inches
  • 6 inches
  • C8 inches
  • D10 inches

Exam tip

Ductwork sizing is critical for proper air distribution and efficiency.

Why B is correct

The 2024 IRC provides tables for ductwork sizing based on the room area. For a 300 square feet room, the minimum size of the supply duct is 6 inches. Options A, C, and D are incorrect as they do not meet the code requirement.

4. An inspector is reviewing the installation of a clothes dryer in a residential kitchen. What is the minimum required ventilation area for the dryer, according to the 2024 IRC?

  • A1 square foot
  • 2 square feet
  • C3 square feet
  • D4 square feet

Exam tip

Ventilation requirements for appliances can vary, so always refer to the specific code section for the correct requirements.

Why B is correct

The 2024 IRC requires a minimum ventilation area of 2 square feet for clothes dryers. Options A, C, and D are incorrect as they do not meet the code requirement.

5. An inspector is reviewing the installation of an exhaust duct in a residential building. The duct passes through a ceiling joist. Which of the following is the correct requirement for the exhaust duct according to the 2024 IRC?

  • AThe duct must be installed at least 6 inches from the joist.
  • The duct must be installed at least 12 inches from the joist.
  • CThe duct must be installed at least 18 inches from the joist.
  • DThe duct can be installed directly against the joist.

Exam tip

Always check the specific requirements for the distance between exhaust ducts and combustible materials to ensure compliance with the code.

Why B is correct

The 2024 IRC requires the exhaust duct to be installed at least 12 inches from the joist to avoid potential fire hazards. Option A is incorrect as it does not meet the code requirement. Options C and D are also incorrect as they exceed the required distance.

6 more in the bank

Answers and explanations for these are in the app.

  • A gas fireplace is being installed in a room with limited natural ventilation. What is the minimum amount of outdoor air required for combustion, according to the 2024 International Residential Code?
  • A residential building has a kitchen range hood that discharges to the outside. The range hood has a total static pressure of 5 inches of water. What is the minimum required ventilation area for this kitchen, according to the 2024 International Residential Code?
  • An inspector is checking the ductwork in a residential building. The ducts are located in an unconditioned space. What is the minimum R-value of insulation required for these ducts according to the 2024 IRC?
  • An inspector is checking the installation of an exhaust fan in a bathroom. The fan is designed to remove moisture from the bathroom. Where should the exhaust fan be located according to the 2024 IRC?
  • An inspector is reviewing the installation of an exhaust fan in an attic space. The fan is designed to remove moisture from a bathroom. Which of the following is NOT a requirement for the exhaust fan installation according to the 2024 IRC?
  • During an inspection, you find that the exhaust duct from a clothes dryer terminates in the attic. What is the correct action to take?

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