What is the term for the minimum distance through air between a heat-producing surface and combustible materials?

The term for the minimum distance through air between a heat-producing surface and combustible materials is known as clearance. This concept is essential in fire safety and building codes, as it helps to prevent potential fire hazards by ensuring that heat sources do not come into close contact with materials that can easily ignite. Maintaining the appropriate clearance is crucial in the installation and operation of heating appliances, light fixtures, and other equipment that generates heat. This distance helps to dissipate heat safely into the surrounding air, reducing the risk of overheating and ignition of nearby combustibles. The concept of clearance is often specified in regulations and standards to ensure safety in various environments, such as residential buildings, commercial establishments, and industrial settings.