Smeg S20XMF Instruction Manual page 15

Instructions for the user
6.5 Defrosting (multifunction models)
FUNCTION SWITCH
THERMOSTAT SWITCH IN POSITION 0
The flow of air produced by the fan ensures quicker defrosting.
The air circulating inside the oven is at room temperature.
The advantage of defrosting at room temperature is that it does not alter
the taste and appearance of the food.
39