I note with interest a paper from Brock University, Ontario Canada.
In the paper they state that there is no warm air above a vineyard if the wind speed is above 7km/hr.
Now those who are familiar with wind speed will know that 7km/hr is incredibly slow. I can only presume that wind and frost behave the same way in Canada as New Zealand and that the noise from a frost fan is just as annoying.
Frost fans depend on inversion frosts to operate correctly and these occur with little or no wind. So according to Brock University, if you have a gentle breeze blowing, all you’ll end up doing with a frost fan is blasting cold air across the grapes (can anyone say wind chill?).
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