What is the temperature limit for air in systems using gypsum boards to form plenums?

The correct temperature limit for air in systems using gypsum boards to form plenums is 125°F. This standard is established because gypsum board, commonly used in construction due to its fire-resistant properties, can begin to lose its structural integrity at higher temperatures. Exceeding this temperature could lead to deformation, deterioration, or even a fire hazard in the event of a malfunction within the HVAC system.

Maintaining air temperatures at or below 125°F ensures that the materials used in constructing the plenum remain safe and functional, minimizing risks to both the HVAC system and the overall building structure. By adhering to this standard, HVAC professionals help ensure that systems operate efficiently and safely, while also prolonging the lifespan of the materials involved.