Zanussi ZCM 5600 Operating And Installation Instructions page 13

The fan oven
Before you use the oven you should wipe it out with a damp cloth to
remove any dust.
The fan circulates hot air in the oven to give an even temperature
throughout the oven. You can make use of the even temperature when
you want to cook a large quantity of similar foods at the same time. For
example, if you are cooking more than one tray of cakes or biscuits
there is no need to swap the trays around during cooking.
Preheating
You do not need to preheat the oven when casseroling and so on.
If you do not preheat the oven you may need to add an extra five or
ten minutes on the recommended cooking times.
Preheat the oven for baking or when you are cooking sensitive food
such as Yorkshire puddings, pastries, scones, soufflés and yeast
mixtures.
When you are cooking or reheating frozen or chilled food read the
instructions on the packing.
When you need to preheat the oven, we recommend you do so for
10 minutes.
Cooking temperatures
Fan oven cooking generally requires lower temperatures than
conventional cooking. You should pay particular attention to cooking
times and temperature settings as these may differ from your previous
cooker.
Follow the temperatures recommended in the cooking charts on
pages 17 - 23. As a guide reduce temperatures by about 20° - 25°C for
your own conventional oven recipes.
If you do not follow the recommended temperatures uneven
browning may result.
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