The Marley Engineered Products 410074000 (F125-25F) Fan Delay is a compact control module designed to delay the activation of blower fans in HVAC and heating systems. Built for compatibility with Marley equipment, it ensures that the fan only begins operation once optimal system temperature is reached, helping avoid cold drafts and boost efficiency. With versatile voltage ratings and ... https://www.partshnc.com/f125-25f-fan-delay