Which of the following is NOT a benefit of ductwork in convection systems?

The enhancement of structural integrity is not a benefit associated with ductwork in convection systems. Ductwork primarily serves to distribute conditioned air throughout a building, playing a crucial role in heating, cooling, ventilation, and air quality systems. While properly designed and installed ductwork can contribute to the overall stability of the environmental system within a structure, it does not enhance the structural integrity of the building itself; this aspect is typically managed by the building's architecture and construction materials.

On the other hand, air filtration, humidity control, and zoning of heating and cooling are all advantages provided by ductwork. Air filtration occurs through duct systems when filters are installed to clean the air before it circulates. Humidity control can be achieved by integrating dehumidifiers or humidifiers into the duct system, allowing for better management of moisture levels in the air. Zoning benefits come from the ability to direct air to specific areas within a building, allowing for customized heating and cooling according to the needs of different spaces. Thus, the other options highlight important functional aspects of ductwork that contribute to comfort and health in the indoor environment.