1x S7F! (converted to 2fans), 2x S5, 1x RPI with Minera app, 1x 3G router in a 4U enclosure (top removed for picture)
(on the floor a couple of S3+)



With cover:




For the extraction fan of the S7, I used an old 120mm fan, removed the propeller and just used the casing to make it more silent: