There's zero space inside above those heat sinks (those get extremely hot) and you can't cool them effectively from the left... Anyway, it works and I love the silence :)
Thanks for more options (Zuxel & QNAP). Netgear is still the winner in this price category (if you ask me): more ports, 5Gbe support.
Its fan is not perfectly silent though when it's near you. Goods news that I made the switch dead silent and ice cold (IC Temp 36C at most) with a Noctua fan and...