Air change is good at 4 times per hour through winter months, but as the temperatures start to climb above 12C in a production shed 4ACH is often not enough. When the ambient temperature is 18C a dairy cow is already reducing feed intake, directly impacting milk yield.
Research in the US, UK and Sweden has clearly demonstrated that air velocity over the cow in its bed  becomes critical. Air velocity well over 1m/s is essential to maintaining rumination against rising temperature or humidity. But how do you cool a resting cow on a lime/sawdust covered matt without lifting bedding or creating a dust storm?
Cyclone Fans from Topcool are designed to cool animals in their beds without upsetting bedding. delivering velocities from 0-12m/s, the Cyclone is the only fan designed purely for cow welfair. And in winter at their airchange setting, the Cyclone will give you 4 steady airchanges at only 20% of their summer operating power. Available in 36", 55", 72" and 84" to suit any shed heights and bed runs.
Topcool Cyclones are also available in
 IE3 high efficiency versions, 
 IE5  direct drive with on board speed management.