 "Pressure fryers" are used for deep fat frying under pressure, because ordinary pressure cookers are not suitable for pressure frying.A "pressure air fryer" (not to be confused with a "pressure fryer") is a recent combination of a pressure cooker and an air fryer, with two separate lids, one for pressure cooking and one for air frying.The air frying lid has a convection fan in it that allows it to air fry foods, similar to an air fryer oven.