The Can Filters Group Inc. has added thermostatically controlled fans in sizes 4 HO and 6 HO, 240 volt 60 hz. The new thermostatic fan is controlled by setting the dial to the desired temperature. The fan has an integrated sensor inside, sensing the temperature of the air?ow every 1.5 minutes. When the air?ow temperature is warmer than the dial setting, the fan will automatically speed up. If the air ?ow is cooler then the set point, the fan will automatically slow down. This Thermostatic fan will maintain air ?ow at the low speed until higher speed is required. No remote sensors no problem!