What is the required angle for the test panel to demonstrate the abilities of the nozzle/gun operator?

The required angle of 45 degrees above horizontal is optimal for demonstrating the abilities of the nozzle/gun operator during the refractory installation process. This angle strikes a balance, allowing the spray material to adequately reach the intended surface area while also providing sufficient control over the material's application.

When the nozzle is angled at 45 degrees, it helps in managing the distance and velocity of the sprayed material, ensuring an even distribution and proper adhesion to the substrate. This angle is useful in simulating real-world conditions in which operators must work, as it closely resembles the typical operational scenarios they will encounter.

Additionally, this angle aids in maximizing the effectiveness of the spray pattern, which is crucial for achieving the desired thickness and uniformity of the refractory lining. Proper technique at this angle is essential for maintaining consistency and efficiency in the application process, which is key to achieving quality results in refractory projects.