If your grill has a chimney, you'll want to make sure that the chimney is the appropriate height to keep your grill functioning properly.
WHY IS CHIMNEY HEIGHT IMPORTANT?
Having too high of a chimney cap can allow too much airflow, causing the fire to burn too hot. This can result in temperature swings.
Having too low of a chimney cap can restrict airflow, forcing smoke to come out of the hopper. This can result in having ash on your food.
WHAT IS THE APPROPRIATE CHIMNEY HEIGHT?
Grills with a chimney should have approximately a thumb's space (¾ inch or 2cm) between the chimney and the cap.
HOW TO ADJUST YOUR CHIMNEY'S HEIGHT
Adjusting your chimney's height is easy: just twist the chimney cap to raise and lower it to your desired height.