The oven should inform you the user, usually with a light on the control panel when it has reached its set temperature. It may take some time to cool down the oven. Fans are popular due to their versatility. They provide evenly distributed heat, faster cooking times, and other benefits. https://ovensandhobs-uk73288.theblogfairy.com/30446138/can-a-built-in-single-gas-oven-and-grill-be-installed-in-your-kitchen