Your Philips Airfryer uses a technology that allows it to circulate air at up to 200°C. While some increase in casing temperature may be noticed, there is no risk to you.
If you leave the Airfryer switched on for a longer time, some areas will get too hot to touch. These areas are marked with the icon shown below. As long as you are aware of the hot areas and avoid touching them, the Airfryer is completely safe to use.
Do not worry - all handles, knobs and buttons that you need to touch during use will stay cool enough to touch.