QUOTE (Iwritecode @ May 27, 2015 -> 11:07 AM)
I don't think it's the airflow. It's basically the grease dripping down onto the metal plates that cover the burners. Then the flames come up and set the grease on fire, even on their lowest settings.
When I grill something like hot dogs or brats where there is no grease dripping down, it's not a problem.
If you are getting so much grease that you are putting out red hot coals you need to get better cuts of meat.
Honestly something is wrong if the grease is putting out red hot coals.