I've a Neff double under counter oven which is a fan oven in the larger lower oven but there doesn't appear to be a fan in the upper part (when you look inside there's a fan in the bottom oven but none visible at the back in the top one).
When the top oven is turned on I would not have expected to hear the sound of a fan but do, which makes me wonder is the top part somehow also a fan oven?
I've checked the model number online (Bosch appears as the results but apparently they're all made in the one place) and can't see anything saying whether it is not a fan oven.
This is a real mystery and keeping me awake at night so please can someone on earth help me? You're my only hope.