Your oven should indicate, usually by an indicator light on the control panel when it is at its set temperature. It may take some time to cool down the oven. Fan ovens are widely favoured because of their versatility. They offer evenly distributed heat, faster cooking times and other advantages. https://ovensandhobs29185.blogkoo.com/can-a-built-in-single-gas-oven-and-grill-be-installed-in-your-kitchen-50628472