For unlisted air-conditioning appliances, what is the minimum clearance from combustible materials required?

The minimum clearance from combustible materials for unlisted air-conditioning appliances is set at 18 inches. This requirement is established to ensure that there is adequate space for heat dissipation and to reduce the risk of fire hazards. Proper clearance helps maintain safe operating conditions, allowing for sufficient airflow around the appliance, which is crucial for efficient performance as well as safety.

While other clearances might be relevant for different appliances or circumstances, 18 inches specifically addresses the situation of unlisted air-conditioning units. This standard is part of building codes and safety regulations to protect both the equipment and the surrounding environment. The requirement reflects careful consideration of the potential heat output and operational characteristics of unlisted appliances that may not have been rigorously tested for safety.