Combustible clearance refers to the minimum safe distance required between a fireplace or its components (such as the firebox, chimney, or flue) and nearby combustible materials like wood framing, drywall, or trim. This clearance is critical to prevent overheating and reduce the risk of fire. Building codes and manufacturer specifications typically dictate these distances, which home inspectors check during inspections. Ensuring proper clearance is a key safety measure, particularly in older homes or with improper fireplace installations.