AirBake pans are designed with a pocket of air sandwiched between two aluminum sheets. The reason for this design is to buffer the heat coming up from the bottom of the oven cell. Remember that, in Pure Convection™, your heat source is from the back of the oven, not the bottom. There is no need to buffer the heat from the bottom. Can these pans still be used during Pure Convection™? Absolutely! In fact, they will also work well in Convection Bake™ and Standard Bake™.