What is the maximum design temperature of air to be conveyed in flexible air ducts and connectors?

The maximum design temperature of air to be conveyed in flexible air ducts and connectors is specified by the standards outlined in the North Carolina Mechanical Code. Flexible air ducts and connectors are typically constructed from materials that can withstand certain temperature limits, and these materials are evaluated for their performance at different temperatures.

A maximum design temperature of 250°F is consistent with typical industry standards for flexible duct materials. This threshold ensures that the ducts can safely convey heated air without risk of damage or failure of the duct material. Operating above this temperature could lead to degradation of the duct insulation or the duct itself, potentially resulting in reduced efficiency, air leaks, or even fire hazards.

Other temperature limits, such as 150°F, 200°F, or 300°F, may not align with the safe operational standards for flexible ducts. Specifically, temperatures below 250°F indicate a conservative approach to ensure safety and performance, while temperatures above this standard may not be supported by the material specifications typically found in the mechanical codes. This illustrates how the designated maximum temperature plays a crucial role in ensuring reliable and safe operation in HVAC systems.