The Marley Engineered Products 1414-2039-000 Fan Delay 115°F is a temperature-activated control designed for use in compatible electric unit heaters. It works by delaying blower operation until the heating element reaches approximately 115°F, ensuring only warm air is circulated throughout the space. After the heating cycle ends, it keeps the fan running briefly to remove residual hea... https://www.partshnc.com/fan-delay-115f