In an industrial facility, the HVAC system has a duct run of 100 feet. The ductwork is insulated with R-6 insulation. According to the 2024 IMC, what is the maximum allowable temperature rise across the duct, in degrees Fahrenheit?
- A10°F
- B15°F
- 20°F
- D25°F
Exam tip
Be aware of the maximum allowable temperature rise for insulated ducts.
Why C is correct
The 2024 IMC Section 406.3 states that the maximum allowable temperature rise across insulated ducts is 20°F.