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.