​ ​ The Chimney Clinic is home of all chimney inspection and cleaning concerns, along with all chimney repairs and chimney relining.

Lintel

11.2.1.5 - All joints and intersections between the hearth extension/ fireplace facing and the chamber (firebox) shall be sealed with medium duty refractory mortar. Gaps or voids at the supporting lintels and joints between steel fireplace units and the fireplace face or the frames of dampers and the fireplace face shall be sealed with the same material or with a higher temperature insulating mortar. 

Fireplace lintel and side gaps

nfpa fire code 211 quick links