The Master Flow control is temperature-activated to help Power Vents reduce attic heat and moisture.  The control ensures a stable attic temperature and is compatible with all single speed power vents. 

• UL-listed thermostat for safety 
• Pre-wired for easy and fast installation, with a 5 amp capacity
• Adjustable temperature range of 60 to 120 degrees F.
• Galvanized steel housing is built to last.