According to the guidelines, transition ducts connecting the dryer should be of what construction standard?

The correct answer identifies that transition ducts connecting the dryer must meet the construction standard set by UL 2158A. This standard specifically addresses the requirements for these ducts, ensuring they are designed to handle the conditions and needs of dryer exhaust systems.

UL 2158A establishes performance criteria regarding the materials used, their ability to withstand high temperatures, and limitations on any potential fire hazards. Dryers produce lint and moisture, and the transition duct must effectively direct these byproducts safely outside while minimizing potential obstructions that could lead to clogs or fires.

By adhering to this specific standard, manufacturers ensure that the ducts they produce will perform safely and efficiently in residential and commercial applications, thereby promoting overall safety and functionality in laundry operations. The distinction with other standards underscores the unique requirements for dryer transition ducts, ensuring they not only resist heat but also manage the particular risks associated with dryer operations.