Dr. Kevin Keener, an engineering professor in the College of Engineering and Physical Sciences, explained how air fryers work to NOVA, a show broadcast by PBS.  

Keener said air fryers work through convection as with deep fryers, but they blow hot air around the food chamber instead of using oil. 

He studies thermal and food technologies and food processing in the School of Engineering. He also holds the Barrett Family Foundation Chair in Sustainable Food Engineering.