A residential building is being constructed with a forced-air heating and cooling system. The contractor is designing the duct system. According to the 2024 International Residential Code, what is the minimum size requirement for a supply duct serving a single bedroom?
- 4 inches in diameter.
- B5 inches in diameter.
- C6 inches in diameter.
- D8 inches in diameter.
Exam tip
Know the minimum size requirements for ducts serving different areas of a residential building.
Why A is correct
Section M1503.2 of the 2024 IRC specifies that a supply duct serving a single bedroom must be at least 4 inches in diameter.