... designed for high humidity greenhouses. With FLC circulation fans, it can help reduce humidity, increase air circulation, reduce insect and pest ... one is variable speed circulation.Product descriptionStainless steel casing, big air flowing, long life spanStable performance, low noise, low power ... :220V, Frequency: 50Hz, Rated Power: 145W, RMP:1400r/min, Air Flow: 2880m3/hGreenhouse Circulation Fan