Gas mark 6 in a fan oven is equivalent to 200°C or 180°C (depending on the source) . Its important to note that oven temperatures can vary, so its always a good idea to double-check the recipe and adjust the temperature as needed. Additionally, fan ovens typically have lower cooking temperatures than conventional ovens because the fan circulates hot air around the inside of the oven and into the food, ensuring a more even temperature and food thats cooked more quickly.