What is the maximum air temperature for gypsum boards to be used in air ducts?

Gypsum boards used in air ducts are designed to withstand specific temperature limits to maintain their integrity and performance. The maximum air temperature of 125°F is established to ensure that the material does not degrade or lose its structural properties under normal operating conditions found in air duct systems.

At temperatures above this limit, gypsum boards risk softening or even crumbling, which can lead to compromised airflow and insulation performance. Proper compliance with this temperature threshold is essential for maintaining the efficiency and safety of HVAC systems. Therefore, 125°F serves as a reliable benchmark within the context of the North Carolina Mechanical Code, ensuring that gypsum boards effectively contribute to the ventilation and heating systems without failure.