Was thinking of a bog standard PC fan or indeed two linked up but not sure how to control the speed so it doesn't sound like a chopper is trying to take off behind the cabinet.
Previously known as psycik
OpenHAB: Gigabyte AMD A8 Brix, OpenHAB with Aeotech ZWave Controller, Raspberry PI, Wemos D1 Mini, Zwave, Xiaomi Humidity and Temperature sensors and Bluetooth LE Sensors
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Windows 10 Host (Plex Server/Crashplan): 2x2TB, 2x3TB, 1x4TB using DriveBender, Samsung 850 evo 512 GB SSD, Hyper-V Server with 1xW10, 1xW2k8, 2xUbuntu 16.04 LTS, Crashplan, NextPVR channel for Plex,NextPVR Metadata Agent and Scanner for Plex