Broan S97020890 Heater Assembly is designed to function effectively through the use of a heating element that warms the surrounding air and then circulates it to provide even heat. This process ensures that there is a constant temperature and there are no cold areas in enclosed spaces. It is designed to work with certain types of ventilation systems and optimizes its performance by of... https://www.hnkparts.com/s97020890-broan-heater-assembly