In addition to extracting hot stale air and drawing in cool fresh air to your growing space, it is also beneficial to keep the air that is in your grow room moving. It's very easy to get spots in the corners of your room where the air is static, and it is in these areas that plant health issues such as damp, mildew and Botrytis can develop. Using an air movement fan helps you to create a constantly moving atmosphere within your growing space that can help prevent such issues from becoming a problem. Air movement fans can also be used to direct at your grow lamps to help disperse heat from immediately below the lamp.