How do you adjust air shutter on oil burner?

To adjust the air shutter on an oil burner, first, ensure the burner is off and cool. Locate the air shutter, usually found on the combustion head, and loosen its adjustment screw. Open or close the shutter to increase or decrease the air intake as needed, typically aiming for a balanced flame color—blue with a slight yellow tip is ideal. Finally, tighten the screw and test the burner to confirm proper operation.