18 years. The air fryer is an improved kitchen utensil and a typical imported product. In 2005, American David McFadden applied for a patent for the air fryer. As of 2023, it will have been 18 years since the air fryer was launched. The air fryer is a machine that can use air to "fry". It mainly uses air to replace the hot oil in the original frying pan to cook the food; at the same time, the hot air also blows away the moisture on the surface of the food, making the ingredients Achieve a similar fried effect.