Axial, inline, and booster fans can be used to heat or cool spaces. These fans rapidly draw in air and then release it in the same axial direction. These fans are especially beneficial if you have frequently fluctuating grow room temperatures. They are easy to install and run quietly.
Axial and booster fans are best used in small places that need to intake or exhaust air quickly and efficiently, as these fans can be as small as 4 inches and only as big as 10 inches.