Australian Importer of Chinook Frost Fans Wind Machines made in the USA for over 50 years. The design of the Chinook blade offers the best frost protection in the industry with the unique fixed Wedge which the aerodynamics uses 92.59% of the blade and widens the sector angle circle of coverage move air over a wider area. Your fruit bud/plant protection has increased from 35 seconds to over 60 seconds for each rotation cycle. Chinook wider sector angle coverage mixes air not only in the horizontal plane but also in the vertical plane.