What is the minimum clearance for masonry fireplaces when located inside a building?

Masonry fireplaces require a minimum clearance to combustible materials to ensure safety by preventing the risk of fire. The correct clearance is specified in building codes to protect structures from excessive heat and potential ignition of nearby materials. A clearance of 2 inches from combustible materials is typically established as the minimum standard. This distance is designed to accommodate heat dissipation from the fireplace's masonry structure while providing adequate protection to the surrounding area.

In contrast, the other options do not meet the established standards. For instance, a clearance of 1 inch is insufficient as it does not provide adequate safety against the heat radiating from the fireplace. Similarly, clearances of 3 inches and 4 inches exceed the minimum requirements but are not necessary for safety, as the established standard is already effective at preventing hazards. Following the minimum clearance guidelines ensures compliance with safety regulations and promotes a safe environment around masonry fireplaces.