Should the air regulator be loosened or tightened in order to increase the open area of the air holes of the Bunsen burner?

To increase the open area of the air holes of the Bunsen burner, the air regulator should be loosened. This allows more air to mix with the gas, resulting in a hotter and cleaner flame. Tightening the regulator would reduce the airflow, leading to a cooler and yellower flame.