What must a Certificate of Fitness holder regulate when using a torch?

When using a torch, a Certificate of Fitness holder must focus on regulating the pressure and flow of oxygen and natural gas. This is critical because ensuring the correct mixture of gases and maintaining appropriate pressure levels is essential for safe and effective torch operation. An improper flow can lead to inefficient combustion, resulting in inadequate heating, increases the risk of backfire, and may create hazardous situations.

Regulating the pressure and flow ensures that the torch operates within the safe parameters, minimizing the potential for accidents and ensuring the job is completed efficiently. Understanding how to manipulate these factors is a key responsibility of someone holding a Certificate of Fitness, as it directly impacts the safety of the operation.