What is critical when drilling an orifice?

Drilling an orifice at exactly 90 degrees perpendicular is critical because it ensures that the gas flow through the orifice is even and efficient. This precise alignment allows for the proper functioning of gas appliances, preventing issues such as uneven flame patterns or poor combustion that can arise from misaligned orifices. If the orifice is not drilled at a right angle, it can lead to irregularities in gas distribution, which can compromise the performance and safety of the appliance. Properly drilled orifices allow for the development of optimal gas pressure and flow, ensuring that equipment operates as intended and maintains safety standards.