EstatePass

Exhaust Systems — ICC M1 Practice Questions

11 questions · 9% of the ICC M1 exam

Worked questions

1. Under 2024 IRC Table M1505.5, what is the minimum local kitchen exhaust airflow for intermittent operation?

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

Where to look it up

https://codes.iccsafe.org/content/IRC2024P1/chapter-15-exhaust-systems

Why B is correct

For intermittent kitchen exhaust, Table M1505.5 specifies 100 cubic feet per minute. Continuous operation uses a different table rate, so the operating mode must be stated. A larger airflow may exceed this minimum; that does not mean it fails the minimum requirement. This answer addresses the local exhaust table only, not every requirement for a particular cooking appliance or installation. Source: https://codes.iccsafe.org/content/IRC2024P1/chapter-15-exhaust-systems

2. Under 2024 IRC Table M1505.5, what is the minimum local kitchen exhaust airflow for continuous operation?

  • 25 CFM
  • B50 CFM
  • C100 CFM
  • D200 CFM

Where to look it up

https://codes.iccsafe.org/content/IRC2024P1/chapter-15-exhaust-systems

Why A is correct

For continuous kitchen exhaust, Table M1505.5 specifies 25 cubic feet per minute. The 100 cfm value applies to intermittent kitchen exhaust, so it is important to identify the operating mode. Larger rates can exceed the minimum; they are not the minimum asked for here. Check other equipment and installation requirements separately. Source: https://codes.iccsafe.org/content/IRC2024P1/chapter-15-exhaust-systems

3. A plan lists a 300-square-foot room but gives no design airflow or duct-sizing calculation. What should the reviewer obtain before accepting a supply-duct diameter?

  • AA fixed 4-inch size for every room
  • Room-load and design-airflow calculations with the duct layout and pressure-loss design
  • CThe room area rounded to the nearest 100 square feet only
  • DThe paint color and ceiling-fan diameter

Where to look it up

https://basc.pnnl.gov/resource-guides/compact-air-distribution

Why B is correct

Area alone does not establish a duct diameter. PNNL connects duct sizing to calculated loads and notes that layout resistance affects airflow. Review the airflow and duct design together, rather than accepting a fixed size from room area. Source: https://basc.pnnl.gov/resource-guides/compact-air-distribution

4. A closet is designed for a clothes dryer. The manufacturer’s instructions give no makeup-air specification, and no other approved makeup-air method is provided. Under 2024 IRC M1502.6.1 (published Version 2.0), what minimum total area must its permanent enclosure openings provide?

  • A50 square inches
  • 100 square inches
  • C200 square inches
  • D288 square inches

Where to look it up

https://codes.iccsafe.org/content/IRC2024V2.0/chapter-15-exhaust-systems

Why B is correct

M1502.6.1 first uses the dryer manufacturer’s makeup-air instructions. If those instructions have no specification, it permits permanent enclosure openings totaling at least 100 square inches or another approved makeup-air means. The question selects the opening route. This is closet makeup air, not the area of the dryer exhaust duct or a universal two-square-foot ventilation requirement for every dryer installation. Values greater than the minimum are not themselves too small. Source: https://codes.iccsafe.org/content/IRC2024V2.0/chapter-15-exhaust-systems

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?

Practice all 11 Exhaust Systems 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