Which of the following locations is prohibited for the installation of fuel appliances?

Restrooms are prohibited for the installation of fuel appliances primarily due to safety concerns. Fuel appliances, such as furnaces and water heaters, can produce carbon monoxide (CO) and other combustion by-products that need proper ventilation to ensure safety. Restrooms often lack adequate ventilation and are typically smaller spaces, which increases the risk of accumulating dangerous gases.

Moreover, the presence of moisture and humidity in restrooms can lead to corrosion and damage to appliances, as well as increase the likelihood of electrical hazards if the appliance includes electrical components. Both national and local codes typically specify that fuel appliances must be installed in locations with sufficient ventilation and distance from potential hazards, which is often not the case in restrooms.

In contrast, basements, garages, and kitchens may have specific regulations governing appliance installation but can accommodate fuel appliances if proper venting, safety measures, and clearances are maintained.