Fahrenheit, Celsius and gas mark — all at once — plus a fan/convection adjustment so your bake isn't 20 degrees too hot.
Fan (convection) ovens circulate air and cook hotter, so we drop the temperature about 20°C / 25°F from the conventional setting.
It's the dial scale on UK gas ovens. Gas mark 4 is the everyday baking temperature, roughly 180°C or 350°F.
Not entirely — many run hot or cold. An inexpensive oven thermometer is the surest way to bake consistently.
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