True or False: Combustion air ducts can serve more than one unit enclosure.

The statement regarding combustion air ducts serving more than one unit enclosure is false. Combustion air ducts are specifically designed to provide air for combustion processes to heating units, such as furnaces and boilers, and are typically dedicated to a single appliance. This is essential to ensure that each unit receives adequate air for proper operation and efficiency.

If combustion air ducts were to serve multiple units, it could lead to inadequate air supply for one or more units, resulting in incomplete combustion, potential carbon monoxide production, and inefficient operation. Moreover, building and safety codes typically require that the design of combustion air systems adhere to specific regulations that often do not permit shared ducting for combustion air. This ensures safety and reliability in heating equipment operation, reinforcing the need for dedicated air supply lines to each unit.