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The BETA-2 can control variable-speed fans by using the current temperature to increase or decrease the fan speed. By increasing the fan speed, cooling is increased… decreasing fan speed will reduce cooling capacity. Using the BETA-2 in this way provides a VERY economical and efficient way of dealing with heat within an enclosed space.
https://www.trolmaster.com/PDFHtml/BETA-2.html
Auto Fan speed control for Day And Night , good for most Fans
Although HIGH Level Efficiency Fans Like the Can Fan 355mm or Max 400mm we would recommend the Proper Ruck or Can Fan Speed Controllers