The maximum air temperature within nonmetallic ducts shall not exceed what temperature?

The correct maximum air temperature that nonmetallic ducts can safely handle is 250°F. Nonmetallic ducts, often made from materials like fiberglass or flexible plastic, have specific temperature ratings to ensure that they do not compromise their structural integrity or performance.

Materials used in nonmetallic ducts can degrade or lose their shape when exposed to excessive heat. Exceeding the 250°F threshold could lead to issues such as melting, warping, or even the release of harmful substances into the air. This temperature limit is set to maintain safety, efficiency, and to prevent any potential fire hazards during operation.

While other temperatures like 150°F, 200°F, and 300°F may represent limits for different materials or components within an HVAC system, they are not applicable to nonmetallic duct systems, which have a specific ceiling at 250°F that ensures reliable and safe air handling.