If you preheat you risk overcooking.
Fan oven for baking cakes.
The general rule for using the fan is to set the oven temperature 25 degrees f 15 c lower than what the recipe calls for using in a regular oven.
Do not preheat for cakes or pastry.
For fan forced ovens or convection ovens the heat is forced through the oven by a large fan so the temperature should be even throughout the oven and any shelf should be suitable.
Do not preheat for any meat or poultry.
Unlike an ordinary oven your fan oven does not always need preheating.
Refer to your oven manufacturer s instructions booklet for the best advice in terms of converting baking times.
Do preheat for bread scones and yorkshire puddings.
Rather be sure to check on your food regularly to see how fast it is cooking.
Therefore the general opinion of many who have had baking experience with the oven is that convection setting is much better for baking cookies pies and small pastries than cakes.
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Preheat the oven to about 25 degrees fahrenheit cooler than the temperature indicated in your biscuit or cookie recipe.
Convection ovens are different from conventional ovens because they have a fan installed inside that circulates hot air evenly throughout the oven browning food much better and faster.
The information should be in the oven handbook.
When using the fan assisted options set the oven to 20 c less than the recipe states as fan assist cooks quicker and is a dryer heat.
Push the button to activate the oven fan if applicable.
Due to this convection ovens bake at about 25 hotter compared to regular ovens which can throw some bakers for a loop.
Even then don t go strictly by cooking time as ovens vary.
As a general rule of thumb if you ve misplaced those instructions you can knock the temperature down by 10 per cent to reduce the temperature a little.
When baking a cake once you re at the desired temperature keep your oven on the bottom element only or on one of the fan assisted options never the grill.
There are a whole lot of cakes that you can bake using a convection oven.
If you bake using a fan assisted oven be aware that these ovens cook things faster.
However the baking time will be sorter so you need to start checking the cakes after about 13 minutes cooking time.
As a general rule you would need to drop the temperature by 15 20 degrees so 160c conventional would become 140 fan.
Fan ovens bake quicker because they generate a more even heat throughout the oven.