Hes already pulling a lot of density. Unless he can somehow duct out all of the hot air, im pretty sure hes capped to capacity due to not having a hot/cold isle containment.
Well, building any datacenter-like facility without hot/cold aisle containment is both inefficient aswell as outdated.
It might be cheaper in the short term, but the increased footprint aswell as less efficient cooling and miners not profiting from optimal temperatures is more expensive after 6 months.
I guarentee that those Sp-30 miners are being properly exhausted.
9 SP-30 miners is about 30kW in a single rack, which is a LOT. If there is not some sort of exhaust fans located directly behind those racks than that building would be absolutely sweltering without a hot/cold aisle config. spreading out the miners means lower temperatures for better hashrate, and the benefit of getting even an extra 500GH per rack that way more than covers the cost of buying extra racks to fit all the equipment.
IMO, the setup is pretty ideal - judging by the size of the building, theres not much harm in taking up a little more space with extra racks