Which construction does not allow the installation of air dispersion systems?

Fire-resistance-rated construction refers to assemblies that have been specifically designed to resist the passage of fire for a certain period. Due to this requirement, air dispersion systems cannot be installed in these types of assemblies as they may create openings that compromise the fire-resistive integrity of the structure. The presence of air dispersion systems can potentially allow smoke and flames to travel through the spaces, which undermines the essential function of fire-resistance-rated construction.

In contrast, the other types of construction—exterior walls, load-bearing walls, and non-load-bearing walls—do not have the same stringent fire-resistance requirements that would prohibit the installation of air dispersion systems. Each of these wall types can typically accommodate such systems as long as they comply with relevant codes and regulations regarding airflow and mechanical systems.