What two items are used to terminate work areas in gunning operations?

In gunning operations, shot boards or perpendicular edges are crucial for effectively terminating work areas. Shot boards are used to control the flow and placement of refractory material during gunning, ensuring that the material is applied only to the intended surface. They help create a defined boundary for the application, preventing overspray and ensuring a clean application profile. Perpendicular edges serve as physical limitations that guide the application process, helping maintain straight lines and accurate thickness of the refractory material being applied.

By establishing clear boundaries, these items enhance the overall efficiency and quality of the gunning operation. They play a significant role in minimizing waste and ensuring that the refractory lining is applied uniformly and according to design specifications. This precision is critical in maintaining the integrity and performance of the refractory lining in high-temperature environments.