Fix the grammatical mistakes: As mantion above the heat is necessary to warm up the air that, thanks to the fan, will be blown out to the room in order to warm up the external ambient (e.g. room, bathroom, kitchen...).
As mentioned above, the heat is necessary to warm up the air that, thanks to the fan, will be blown out to the room in order to warm up the external ambient (e.g., room, bathroom, kitchen...).