“All ovens cook by convection – where the hot interior air does the cooking. What appliance manufacturers call “convection ovens” have an additional heating element and an extra fan to make the air circulation more efficient and effective, boosting the heat transfer from the air to the food, and thus altering the way the food cooks -faster, dryer etc..”

So the answer is YES, they are safe – they are the same, as far as heating, as your regular oven.