4 x 10 Ultra-Quiet Register Fan Auto-Fan Speed Adjust with Thermostat Control Ac Vent 62171773"Front temperature sensor, real time monitoring of indoor temperature. Intelligently adjust the wind level according to the set room temperature. The greater the temperature difference, the higher the wind rating, going up or down one notch every 5 degrees Fahrenheit. Temperature difference between 0 and 5 degrees Fahrenheit, wind rating down to 2. The temperature difference is lower than the set temperature, the wind level is reduced to 1 gear, and
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4 x 10 Ultra-Quiet Register Fan Auto-Fan Speed Adjust with Thermostat Control Ac Vent 62171773