Procool fans have a higher airflow to noise ratio than any other fan in its class.
The specially designed blade reduces air noise while increasing airflow.
Max noise is rated at 14dBA while delivering 32 CFM of airflow.

All SX and SXT models feature a removable blade.
This allows for easy cleaning and maintenance. When regularly cleaned and properly maintained, these fans will run for many years.

Procool model SXT80 fans are temperature controlled automatic on/off with variable speed, ranging from 1200 RPM to 2400 RPM at full speed. SXT80 fans have a temp sensor that should be located on or near the heat source. The sensor tells the fan when to start and stop and how fast to run. When the sensor detects heat above 75-77°F the fan will start. As heat increases the fan speed will increase. The fan will reach full speed of 2400 RPM at about 104-107°F. The fan temp sensor can be moved closer to the heat source to optimize or fine tune fan operation. As temperature levels drop the fan will slow down. Once the temp falls below 75-77°F the fan will shut off. See the chart below for illustration.
Note that temp ratings have a +/- 3% variance.

The SX series fans are fixed speed at 1600 rpm. Also producing 32 CFM of airflow. Rated at only 14 dBA, it is virtually silent. The best choice for the most noise sensitive applications.