The Mistraal Drum Fan is a true directional airflow fan which provides maximum greenhouse air movement. Unlike regular open cage fans which tend to move the air in a ?ball"-shaped flow around the fan, Mistraal Drum Fans (which are set inside a stainless steel drum) force the air down the greenhouse. Mistraal Drum Fans improve heat distribution and reduce temperature gradients. For larger areas use 8 fans per acre.
Hotbox Mistraal Hanging Air Circulation Fan