What is HAF? Small circulating fans operating continuously to create a gentle 'racetrack' air pattern in a greenhouse thus mixing the air mass. Other names for HAF fans are basket fans, stir fans, circulation fans, or mixing fans.
Why mix the air mass? • Air stratification practically eliminated. • Corners of greenhouse are 'scrubbed' eliminating hot and cold spots. • Condensation reduced. • Carbon dioxide utilization improved. • Humidity within the plant canopy is reduced.(See patterns below.)
How do we use them? • Place one VS12PA every 50' to 60' feet and hang at gutter height. • Place horizontally. No need to aim at crop or angle fans. • Place two rows in each bay. One row going up. One row coming back. • No need for complicated formulas.(See patterns below.)
Where do we use them? All greenhouses large or small, whether naturally ventilated, mechanically ventilated, cooled, and or heated, will benefit from horizontal airflow. All plants whether flowers, vegetables, shrubs and trees will benefit from horizontal airflow.
Why Schaefer fans? • Schaefer fans have a patented guard allowing for more airflow, with less restriction than typical 'basket' style fans. • Schaefer fans are very quiet because they are smaller and less restrictive. The Schaefer 12" has airflow of competitors 20" fans. • Schaefer fans use totally enclosed, maintenance free farm duty motors. • Schaefer fans come with a solid mount. A solid mount is important to the air pattern. If fans are hung with chains they can twist and sway creating a disruptive uneven air circulation pattern.
