WindStorm™ stir and circulation fans provide a wide range of CFM deliveries for different applications. Choose from the variable-speed 20", 24" and 36" fans where powerful streams of air are needed to aid summertime cooling for swine, poultry, dairy and other livestock applications. The 18", three-speed circulation fan and 20" or 24" two-speed circulation fans promote gentle stirring of air to reduce winter heat stratification and can be installed other areas manually adjustable air circulation is needed. The 3-speed 14" and 18" Dynofan™ options are suitable for indoor/outdoor use to stir air and keep animals or people comfortable.